To think dd’s boyfriends behaviour is odd?

That’s not appropriate at all. Actually none of it is. Is he contributing anything? I would want him gone. You’re not a hotel for a rude young man who gropes your daughter in front of you.

If he is going to uni then he must have great English, time he got practicing

He could be a stoner? Don't worry OP the relationship will most likely fizzle out 🙂

It sounds like he's suffering from bulimia/ anorexia with binge/purging.

Poor lad. I don't think it's 'odd' so much as sad if he's got an eating disorder. But I doubt he'd open up to you about it if he barely speaks.

I guess you could ask DD if she's tried to talk to him about it? Leave some ED charity leaflets around or something? He's probably quite ashamed and embarrassed about it. So you may not really be able to do much. Just try and make sure DD knows she doesn't have to stay with someone to try and help them or make them better.

This too. I find some young women like being needed so desperately, but as they get older they start to want a man who can take care of himself and has his shit together. Someone not so ‘poor lamb’.

It sounds like he is bulimic. That aside he sounds rude and disrespectful. You don’t have to have him as a long term guest especially as your daughter is often at work. He’s old enough to be at university so can find somewhere else to stay. I wonder how long before his neediness puts her off. Do you have other children at home.

I would explain to your DD that if he’s staying free of charge in your home he has to fall in with your family routines.

He eats at the table. When he gets up and comes down in the morning he says morning / Hi / Alright? and greets the family. He says goodnight before heading up to bed. He accepts a drink from your Mum. He makes an effort to chat as a gesture of gratitude for your hospitality. And if she’s working all day, he goes out. I know you said he’s got nowhere to go, but he can walk in to town, get a coffee, meet your DD for 10 mins, sit in the park and go on his phone, look in some shops. He needs to just kill time, like we’ve all had to do.
I would not entertain him staying in her room all day while she works.

He has to converse. He’s an adult.

Sorry they were shagging in the living room??

He may be extremely shy, I was when I was around 16-21, to the point I couldn’t even hold a conversation because I’d get embarrassed and overthink everything too much. I was the same with eating, I couldn’t eat in front of anyone or let them know I’d eaten as odd as that sounds, if I was at my boyfriends I would starve until I got home, at home I would eat barely anything and then raid the kitchen when everyone was in bed

I would insist on meals at the table in your housem no food in the rooms. Tell your dad this stops now or he can sleep elsewhere.

Unlike many posters replying here, I wouldn’t necessarily think eating disorder. As his social skills are so bad/shy, then I don’t think it’s surprising that he doesn’t feel comfortable eating with you. Sometimes it’s a fine line between shyness and rudeness, but he’s an adult and I feel he should be able to at least make small talk with you. The language barrier is kind of irrelevant, as he obviously has some English, and we can all manage to get by and show friendliness and appreciation even without much language.

Is that your problem?

Yes it's odd?
Why is he living with you. I would say no.
Nobody should make you feel uncomfortable in your own home.
The minute you dont feel comfortable is the moment he shouldn't be there. It's your house

Was there any discussion about him staying in your home? Are you saying he is sexually touching your daughter in front of others?

I know a few polish ppl who act very simular to what you describe, im not saying they are all the same as they are not. Just as all English ppl are not the same. But from what I know its a reserved country and the ppl are more reserved. my friends are very shy with new ppl. They wont eat or drink in front of someone they don't know well for example..
It will take him time to get used to you. I have 2 teen daughters and i can say in the situation you describe I would be okay with it. He actually sounds like a really nice decent man. He feels safe' when your daughter is around which is why he's always touching her. (Especially as hes staying in a strange place that isnt his home)

Left him in a difficult position. He's not your responsibility

Food – the clearest explanation to me is that he has an eating disorder. Probably some type of anxiety disorder as well.

Touching your daughter – is he being explicitly sexual, or just physically affectionate?

He sounds socially inept, odd, reclusive and possibly saddled with an eating disorder and I’d be feeling pretty exasperated too. I’d also be concerned of my daughter seemed to be attracted to fixer uppers. It never ends well.

It sounds like social anxiety, he may come out of his shell after some more time.

My DD had a BF who wouldn't speak to us unless we spoke to him, and stayed in her room when she was at work.
He turned out to be a really abusive piece of work (the polite version).

He's a walking red flag in my view and that's before the eating issues. Can you have an open conversation with her, or better still with both of them?

How long is he staying? Has he moved in with you for the rest of the summer?

YANBU I wouldn't feel comfortable with this either. Sounds like you need to have an adult conversation with dd about how you feel and what your expectations and boundaries are.

It’s not your job to house him, you should never have agreed. You hardly know him, and your DD had only been with him for 6 months.
He can go home for the summer