Need help!

I am extremely emotional. About 3 months ago I decided to just give up on loving my ex of ten years. He had a baby with another woman seven years ago (yes he was cheating). I love and cared for this child like he is my own. In the last month or so they moved in with me because the childs mother said that she can no longer handle the child living with her. I agreed to the situation because like I stated previously... I love this little boy. I started talking another man about two months ago. He said he will not deal with us living together so I told my ex that he can't stay, but the child can. I told my current boyfriend and he said he don't want me dealing with the child because if I'm dealing with the child, I'm dealing with his father. I told him I would not disown the child so he left me. My ex of ten years won't do right and now that his child is living with me I don't feel like anyone will date me. I don't know what to do!! Please someone, anyone help me!!