My Boyfriends trying to lock me down with a baby

So I’ve been talking to this guy online for three months now we FaceTime and we Snapchat but he’s 19 and I am 17 and we’ve been dating while we made it official last month but everything has been going downhill ever cents I told him that I talked to my ex I only talked to my ex because he said he missed me I told him I missed him toI missed our friendship because we were friends before we started dating close friends best friends I told him you got mad I told him was a really big deal it’s not like I had sex with them but I did it a few weeks pass he started acting different I told him we couldn’t like any other girls pictures and he still did on Twitter I know that shouldn’t really matter but he promised he wouldn’t. Every time I tell him I want to work things out with him he’s always leaving me on open or Reading my messages and not even replying when I confront him about it he’s always like I’m busy with work and college and stop assuming I don’t want to be with you. So I’m like OK it’s fine if you don’t want to be with me that’s fine because he makes me feel like he doesn’t want to be with me why ignoring me and making excuses like you open my message you might as well reply you know that like he only shows me affection and tells me he loves me on the phone were talking and he tells me he wants kids with me in the summer when you come see me he wants to have a baby we don’t even live the same place and he’s like yeah I want to baby and I wanna get you pregnant how already told him I’m too young to have a baby and that I how many were finished high school who’s in college we don’t live the same place I will both carries a baby idk what to do sorry for the spelling errors