Still need help on this issue

I’m having a problem regarding a man, Ive been meeting him for a month now, once in a while, and I know it’s about sex and Im ok with it.

I know he’s not the man for me, he doesn’t need me or appreciates me and he has other girls, and even though im trying not to get myself down lately, he has better girls and its a fact too, the thing is…

He keeps coming back and talking to me and I always end up meeting him. I don’t really know why he keeps coming back, because he surely must have more people, but he does.

What im having trouble with, is the time in between, its like I kinda wait for his message everyday, and live in a constant wait, just overall anticipating it you know? When I get home, subconsciously I wait his text, when im working, he makes his way into my mind, It kills me, id like to be able to just stop thinking about it. It would make it better when he texts me. If I could stop thinking about it so much, it would go way more calmly and maybe id appreciate it more when he does text me

If i thought less about the “is he going to text me today to be with me” all the problems would disappear because i just like to have control over life and i like to know if im doing something, so if i could just control my thoughts that would help a lot

Any advice for this not so serious problem but that takes too much space?