My partner (32m) and I (22f) started dating about 10 months ago. We were open for 4 months and agreed to close things. We had the discussion to close our relationship and he assured me that if I ever wanted to reopen things that we could. For a few months now I’ve talked to him about wanting to reopen our relationship and he gets extremely angry every single time. He claims that I don’t love him and that he doesn’t understand why he isn’t enough for me. I won’t go into detail about the arguments but he makes it clear he isn’t and won’t ever be comfortable with it. I’m just at a loss because he established that if I wanted to open things we would and I don’t understand why he’s now so against nonmonogamy after practicing it with me and partners before me.