<human>: Give me the gist of the text in a nutshell

I've been with my boyfriend for just under a year, and he knows that including him I've slept with 13 guys. Yes, quite a lot for my age but I had a couple of serious relationships (around 1 year each) and the rest usually came as a bit of a post-break-up surge. 

I wanted to be honest with my BF so told him my number when he asked. He has only slept with 2 people. He didn't seem to overly react when I told him - it was very early on in our relationship.

Ever since then, however, he brings it up every couple of days. He has become fixated on the idea that if he and I don't work out that I will just "go back to that" and "sleep around" again. He also tells me how disgusting it is and how wrong it is to behave like that etc. I feel it's worth mentioning that I do not conduct myself like a - insert derogatory term for promiscuous female - and actually when my friends have asked how many people I've slept with they're very surprised to hear, because they didn't think I was "like that". 

My BF and I keep having huge arguments because I refuse to say to him that I regret doing that, I refuse to be ashamed of myself, and also I can't promise him with certainty that I'd never casually hook up with someone again if we didn't work out. I genuinely believe I am out of that stage of my life, but I don't want to make huge sweeping promises when I don't know exactly how my mindset would be in the event of a hypothetical breakup.

Am I justified in losing patience with his constant verbal attacks about it, or should I be more patient because this is obviously something he cares about deeply? 

I don't know what to do and would love some advice. Thank you.
<bot>: I slept with a lot of boys before I met my BF and he regularly calls me disgusting for it, and I don't know how to proceed.