Im seeing this guy, and were sleeping together, but he wants to see if it will develop into a relationship?

What's wrong here is that you've got it all the wrong way around.
You should get to know each other first, and develop a relationship.
Only when you've done that, and are sure that you both feel the same way should you have a sexual relationship.
Yes - that may be old fashioned, but it makes so much sense.

You're not stupid, but I think if he wants the relationship to be more serious he should be more respectful if you don't like it. It seems like you've fallen into the pattern of sexual intimacy while he can act like a bachelor and do whatever he wants. My question though, is what do you want? If you want to get more serious too, tell him to stop because it could be considered flirting. If you don't want to be serious and want to continue no strings attached, maybe find some sexy guys to follow and see if he likes it. Either way, talk things through and see if you're on the same page. If not, it might be time to move on and find something real. Good luck.

If you aren't in an official relationship it doesn't count. I was in a similar relationship with a guy before & ended up falling for him & got very upset when he would like other girls pictures. But if you aren't officially together, he isn't doing anything wrong. & please do not have unprotected sex, that cannot end well at all. You have to protect yourself!

move on