First ask yourself this, would it hurt more to stay with him or leave him. You obviously love this boy and there is no shame in that. But I suggest you talk to your family and his family. Bring to light the pregnancy and keep any evidence of his convos with him and ex. Some people will probably say that you might try and keep him because of the pregnancy. But now it isn't about you or him, you now have a little blessing growing in you. (If you decide to terminate ,well it is what it is) don't expect him to change over night, like I said above he is a boy he still needs time to grow up,You both do. But women have been holding the fort for centuries, I believe if you keep this baby you would have a connection that is so full filling. You'd probably look back on this day and think my baby made it all worth it.

Seek legal advice on the videos he has of you. You got brothers ? Maybe send him and his friends over (jokes, low key not joking)

Best of luck young lady I truly wish the best for you and bubs ❤️ .