Break up

My boyfriend and I were together for over a year(on and off mainly on) we broke up the day before Easter. Things right now are harder for me. He started dating this girl not even a week after we broke up, they started dating Wednesday after we broke up and well we are trying to be friends but I can’t get past the feelings that I have for him and the things that we shared together. I want to be with him but I KNOW that he doesn’t want to be with me after I have my son because he says that my body won’t be the same as it was before, I know this and he knew this from the moment that I told him that I was pregnant. I think that he is just scared but I don’t see why he had to run away at a time that I need him the most. I don’t know how to deal with being on my own after being with someone for so long. Being together for over a year is a big step for me and to watch him walk away after that really is hard. I don’t want him out of my life but it seems like he doesn’t want to be in a relationship with a mother or even someone who is pregnant with a kid that is not his. I am just scared that I won’t be able to find anyone like him. I am only 16 but when you know you love someone you just know because of the feeling you get when your with them and the feeling that you get when you kiss them. I love him and I don’t want him to be out of my life… I am scared please help!