Okay this is really hard for me and I want to be as normal and rational as I can be about it but I need your help! My ex and myself ended our relationship 10 months ago and he is with his new girlfriend officially 4 months now and has decided he wants to introduce her to our DD who's almost 3.
Honestly I'm not happy about it but this girl has really calmed him down as he had been going off the rails and not bothering with DD in the months after our break up so I am weirdly glad of the relationship as he has since been more respectful of me and his time with DD. I have done a bit of Facebook stalking
and even though she's only 23 she seems like a nice girl and I'm probably going to agree to her meeting DD in the coming weeks though it makes me so sad, it's just not a situation you imagine when you bring a new baby home 
I really don't want to be a controlling ex but I'd like to ask them to respect some ground rules like no pics on Facebook (she's very very active on Facebook and seems to post multiple times a day about everything), is it unreasonable of me to ask them to not be all kissy in front of her? Or should I just let them get on with it and mind my own business? Any advice please because part of me is totally irrational but the other part thinks sure what harm is another person to love her in her life? I'm also hesitate because just two weeks ago he told me he wasn't sure about the relationship and thought it would fizzle out
but now apparently he's completely certain!