Search Results: ask him to give me a second chance

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

I've been on and off with this guy since December. Never officially dating but definitely an item since he was staying the night 4-5 times weekly for a weeks at a time. He blocked me because he thought an old flame and him were going to work back, which was hurtful to me but again, we were on and off and never official/exclusive so it was whatever. That was in April and he recently unblocked me and hit me up apologizing and promising it would be different this time if I gave him a second chance. This convo was on last Monday. He was doing better with communicating through out the week, yesterday HE asked ME if he could take me out that night (saturday) I confirmed plans and the last text was sent by me at 12:30pm. Never heard from him again until this morning and he said he's sorry and he took a nap and just slept the whole time. I told him to forget it, I'm done wasting time. He said he understands, he dropped the ball and if I change my mind I can hit him up. Should I stick to my guns and toss this or give it annoottthheerrr shot?
TLDR; on and off for 8 months, he disappeared for a while, he came back and I told him we'll see how he does this time around, he makes plans and then stands me up and says sorry, I was sleeping. Dump or give him the benefit of the doubt?