Why does my boyfriend always throw the past in my face? I don't know what to do

I have been with my boyfriend for 6 years..i was 14 when we started dating and he was 19. We have lived together from the very beginning. Our relationship wasn’t the greatest, it has had a lot of ups and downs…and we have always worked through it. for the past while it has seemed like everything was finally looking for the better…until he started throwing the past in my face..what I mean is people I’ve slept with before him, he throws those guys in my face..it hurts like hell considering I hate every guy I slept with before him now..and in the end its always the same story “im sorry, I’ll quit, I won't do it again” and I always forgive him..we are engaged, planning to get married someday..so why the hell are we having these stupid immature fights? I don’t want to go through this anymore..but its hard to leave him over such a small thing and its hard to leave him because I'm so used of him, and I'm scared to leave him because we’ve been together for so long..advice? I love him, he’s my best friend..and our relationship is great besides this problem..we always have so much fun together I guess I don’t want to leave him but I have no idea how else to fix this problem.!
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he brings it up because of sex..if I say no one night..he'll freak out and say go f*** so and so..i know you want to..i never get it anyways, you MUST be cheating...FYI - he does get it at least a couple times a week! like almost every night!
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and I have told him how I feel..and all he says is you can say sh*t back to me, it doesn't hurt me..and I say I don't want to fight! and cry..blah blah blah..ugh I just have no idea what the hell to do anymore.!
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last night was the last time he brought this up..and I did tell him I'm sick of it and would leave him and he didn't seem to care..then he's like how are we going to fix this? like hello! its YOU that needs to fix it... :(
Why does my boyfriend always throw the past in my face? I don't know what to do
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