So I've been with my partner for 3 years, I have a four year old girl from a previous relationship although her biological father has never wanted to see her, so as far as my daughter knows my partner is her father and he's done a really good job in raising her. About two months ago we found out I was pregnant which was good news as we had been trying for a baby, a few weeks ago my partner told me he needed space so he moved in with his mum. A week later he told me he's not ready for a commitment and wants to live his life before settling down, which really confuses me as we have been living together for three years and he has raised my child as if she was his own, and we were trying for a baby for over two years, I found out today he has started seeing someone, he tells me he still loves me but he's seeing someone to try and get over me, I really don't know what to do, a month ago we were happy, we were engaged and planning for him to adopt my daughter, I don't know if I should be trying to fight for my relationship and family or if I should give up