Relationship help needed!

So my boyfriend and I have been together since April 2017. He was a boy that went to parties, smoke, and drank. He soon stopped that once we found out I was pregnant in July. He quit smoking, didn’t go to parties anymore, and made me think he was head over heels for me. I was the same with him, and everyone else envied the relationship we had. Fast forward to August 28, 2017, i miscarried with our baby at 7 weeks 4 days. This was DEVASTATING, and still is to this day. After that event, I grew closer to him for obvious reasons, and we seemed to get through the situation together. Our relationship was PERFECT! Fast forward to January 2nd, I found out that he has been smoking pot again and only had $23 in the bank. He is now a liar, and breaks promises like it’s not a problem. I just recently found out that I’m pregnant again, and he has told me to get an abortion or he will leave me. Not to mention, we were TTC since the loss of our baby. He told me he wanted this baby and his actions during intercourse obviously matched up. I purchased a car for him on the 31st of December to help him be able to find a better job so that we could get our own place. He screwed up the car and now it doesn’t run, and he is refusing to pay me back for it. Anyways, he now ignores me and turns his phone off so that I cannot call him. He no longer looks at me the same since I have asked him to quit smoking and now says he doesn’t care what I want. He will do as he pleases. He goes out and smokes before work with a little friend of his. I have contacted his friend and asked him to please not associate himself with Noah (my boyfriend). I get threatened and yelled at each time I contact one of his friends (am I wrong for this?). I want the best for my man, and I want him to have a successful future. He dropped out of HS at 18, and I began college when I was 15. I am trying to encourage him and motivate him to do well in life, but he takes it as I’m controlling him. I get told that I ruined our relationship and that it’s all my fault for not loving him for who he is ( a pothead). I love him so much and I’m clueless on what to do. I do not feel like I have the strength to leave.

I need some serious advice ladies, please help