SUBREDDIT: r/relationships
TITLE: Me (19F) and my ex (19M) broke up a week ago. I still have feelings for him. We were together for 3 months. We still have sex, (recently) and he says he doesn't want to anymore because feelings will get hurt.
POST: We got together with no intention if falling "in love" he broke up with me for the reasons of we have different viewpoints on things. 
I have tattoos, he doesn't like it. We both crave attention and affection hence why were still having sex after a breakup. We got along great I thought.
 We love talking, we talk a lot. He spent the night last night and we had sex a lot and then a few times today as well then he got all weird again saying we shouldn't have sex again or hang out.

He had invited me to go to a concert tomorrow night and to a play this weekend, but he is very unbalanced on wanting to take me. 
I'm only upset cause when he initially broke up with me I thought it was over his ex and how I somehow didn't compare, but he doesn't like her at the same time. His reasons are: tattoos, religion, some feminist things (not extreme), and he also gets this vibe that I love him way more than he feels he could love me. I don't want a serious relationship to the point of wanting to make it forever. We both feel that way. 

I really need advice on how we can just be friends and show him I'm a great girl. He tells me already I'm a million types of great but I just don't know if I believe it.
TL;DR: 
Me (19F) and ex (19M) have a friends with benefits type deal going on but there's a lot more emotion behind him. Need advice