Search Results: leave him or give him a chance

Long story short we've had a complicated history together, we've known each other for over a year now through an online dating site. He has given me countless of chances to make things work but he finally is at his last straw and doesn't want to give things a chance anymore and is tired of all of it. It wasn't the greatest start to start something potential. I was thinking of giving it a few more weeks and ask him to go out for lunch or dinner and start fresh and leave the past in the past. (there are other things that have happened, this is just the short version of this)

So, I started chatting with a guy. Everything was going well we were getting a bit closer. We talked about sex a lot, more than I'd usually speak with someone I just started talking to. And then he disappeared. For more than a week. Just zero communication. Then he popped back up and I was very hesitant and he convinced me something was wrong with his phone and he had to have it fixed or something. So I said that's a red flag but continued chatting with him.

As he seemed to be interested in me I laid it out flat that there's a guy in my life who I had feelings for and I was trying to distance my feelings since I knew for sure that the guy liked me and wanted me but wasn't capable of loving me or us having a serious relationship (due to his next level work ethic). I told him I honestly don't know what would happen around that guy since my feelings seemed to destroy logic whenever we were in that position where I should say no and tell him to leave me alone. But improvements were happening though. He told me that was fine, he understood I was lonely blah blah blah. Then we started getting to know each other better and once while we were chatting he asked to see a pic of my undies... so I said no ofc. Then boom! Same thing happened again. Disappears for weeeeks.

He's back now and I just don't trust his motives. I always question if he's just being in-genuine. But he is a really nice guy, similar though patterns, and we have good chemistry. But I'm on the fence. The second time he said he left (basically ghosted me) because he was sad about how the other person I had feelings for was close to me and he was far away. The thing is, I have zero feelings for the person I was getting over now, and totally not lured by his charm anymore. But I still don't trust this disappear guy. Tell me your thoughts