What would you do in my situation, I can't move on?

I've been dating this man, we agreed to a relationship but I feel like he's hot and cold. I also see him staring at girls and feel disrespected by that. He doesn't really prioritize me as he always wants to hang out at night. He says he has work and gym and can't find other time for me. We always have sex and cuddle at his place. When I ask him he says im the only one he has. He also texted me a lot before, everything nonsexual. I don't know if i should move on but I really love him and whenever I try to block him I just end up unblocking. And then he will message me

What would you do in my situation, I can't move on?
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