Situationship, should i take my distance to see how he reacts?

SITUATIONSHIP with a man older than me. Should I contact zero him?

I dont know where else to ask. Long story short: Me 32F, him 38M.

I confessed that I like him not long ago. He didnt stop talking to me though he started looking for me a little bit more and said that he enjoys talking with me. He teases me a lot. He said he doesnt want a romantic relationship. I make a lot of sexual references to him, because I told him that i want a sexual relationship. No talk about our relationship, no ground rules, nor nothing. Nothing have happened, just sexting and stuff. He sometimes begins conversation but then forgets about me, and stops answering but he gets online.
If he doesnt look me in one social media he does on the other one... He usually writes to me late at night, like 8-9pm. But i see him online from time to time but not writting to me or anything. He also texts me while at work, random chat, what is he doing, etc. Then he cuts answering and begins again at night. Weekends i try not to text him, since well, i want to give some space to him.

I think i can start liking this guy, even though he said he is not looking for romance. He has confessed several failed relationships and why they failed. Like he mentioned that she was getting bossy, then other one because they were overdramatic, etctc.

What is funny is that he sometimes teases me saying im bossy... Still continues to talk to me.

But, what is driving me crazy is if he is having the same thing with any other woman... Like, if we are having some FWB thing i want to be the only one. How should i approach that? do I wait for first encounter? or what?

This is my first time a situation like this. I need a mans advice. What is he thinking? What shoudl i ask o notice to identify is he is beign honest? Please help me! Should I text him first? I dont want to sound needy...