How do I know if my Boyfriend is still in Love with the mother of his child?

[Danni]

You are obviously bothered about your boyfriend having feelings for his ex. When a couple have a child together there will always be that bond. If he still sees the child then he'll have contact with the mother. You should talk to him about his feelings, if he has feelings for his ex girlfriend then where do you fit in.
If he says he doesn't and its all over then you should be happy with that. He obviously likes you as why is he with you.
Facebook can be more problematic than its worth sometimes. Maybe he doesn't want you to communicate with her or maybe he doesn't want her to know his business.
I urge you to talk these things through with him.
Good luck