When is it time to give up

I have been with my bf for 2 years and in a serious relationship. Last year I found out we were pregnant but 12 weeks in the baby's heart stopped. Surprisingly our relationship grew stronger and we started doing dates and romantic stuff. But now, a year after, he is distant. He keeps saying only negative things to me but then hours later is sweet. It's a cycle. I feel like I'm on an emotional rollercoaster with him and he doesn't seem to care no matter what I say. I have had anorexia for years, and after everything it got really bad and I dropped a lot of weight. He said he fell out of love with me a little because I'm not "what he bought" and that if I got back to where I was when we met he would lust for me again. I feel like it's a control thing. He sets standards that I have to meet down to a T. The way things have been just the last month, have significantly gotten worse. Out of nowhere he told me he went on a date when 2 days prior he was all in love. Now (weeks after that) he was telling me he was only talking to me and how in love we were but then literally an hour after he said all these women want him. All these women know exactly what he's worth. And continued to just say horrible things. Last night he said he doesn't want to love me anymore, that I have nothing to offer him... I don't know what to do. I feel like I'm always sitting here waiting for him after and the cycle just keeps repeating. I don't know if I should just walk away... It's hard because I never fell out of love with him and the rollercoaster I've been on he had me crying over him then laughing and being with him the next. What should I do. This is the second time in a month he has done this whole "surprise me with girls" out of nowhere and said that we aren't together. I know I can't make it through if he does it a third time.