If my boyfriend suddenly don't care anymore or just wants to be with friends and doesn't answer his phone when I call, what can it be?

He has either found someone else or is just wanting space. Either way let him be. If he does not have the decency to discuss this with you, you don't need him.

I don't know I love him so much and we have a 10mnth old baby.

He is being very childish. You two need to talk. Does he see his child?

You can be good parents if not romantic partners, and that means knowing your rights to get child support AND visitations settled.

He doesn't feel the same as you or isn't ready for what you and your baby needs of him. Or has no clue how to be a man and father or mate. 10 months is just the beginning of figuring out the adjustments that need to be made after giving birth.

How old are you both and how long had you been together when you got pregnant?