I haven't read all the responses, got to about page 6, but in case anyone hasn't suggested it, he sounds like a classic narcissist OP.
When you are home, do read up on narcissism - there's a chap on YouTube - H G Tudor, who has some very informative material, or look up narc site.
It seems to me as though you are very genuinely empathetic which makes you vulnerable to these types. In addition you are also emotionally vulnerable because of where you are in life.
I bet in the beginning this man was wonderful - attentive, doing renovations on OP's house, which is odd behaviour in the new stages of a relationship. Basically it's all about control and using you both physically, financially and emotionally, to fill a void in his life.
These people are very dangerous. They love bomb their targets in the initial stages of a relationship before going on to behave like total monsters.
They mess with your head which is why you are here on a forum, bewildered and looking for support, because you know deep down his behaviour is wrong.
Folk like this man aren't capable of empathy and always find reasons to make their targets feel like everything is their fault. They are perpetual victims and in this man's addled head, he probably does thing you are being unreasonable, if he's not self aware.
So no, I don't blame you, but please don't stick around or allow yourself to believe this is a one-off, because no doubt this man will try to plead special circumstances when he realises he's toast.
I would avoid confrontation with him, or any dramatic gestures. Hopefully he hasn't got any keys or ties to your life back home.
My genuine advice is be as grey and boring as possible. If you can't face the inevitable drama of sending him home, don't have sex with him and engage with him as little as possible.
You need to bore him so that he fucks off his own accord. So sorry this is happening and sorry for your loss. 💐