help! what should I do?

Me and my boyfriend of 6 years recently split up (due to my insecurities of him being away for a stag do and my mind running overtime on scenarios, I stalked them on Snapchat maps to check where they were). he didn't like this and broke it off with me 2 weeks ago. We agreed to be friends and have hung out a few times over the last 2 weeks. last night I had a birthday party and of course he came. We ended up at a friend's house playing drinking games and everyone was very very drunk. I needed to get a taxi home, and he very kindly said he'd lend me money for it. We left the house and went to a hole in the wall for money but as we walked he started talking about how he was sorry for how he'd handled things and how he still cared about me, then he apologised for not getting me a birthday present and that he could give me a "present". We spent the next hour talking about how sleeping together would be a mistake, it wouldn't help me get over him, I'd be constantly questioning everything (like I usually do with my insecurities), he'd wake up feeling guilty, etc. i'm very proud of myself for saying no, because i still love him but I've resigned myself to the fact he doesn't love me, which is what he said when he broke up with me. i was very drunk and would have very happily fallen into bed with him. But now, a few hours later, we're both sober, he's still talking about it and asking if we could do a friend's with benefits thing. I've been thinking about it the last few days before he ever mentioned anything of this sort and I don't know what I should do. any advice would be amazing x