[ Singles & Dating ] Open Question : Did I do something wrong? bf uninterest in sex?

I like this one boy tried like sticking to him and that's it. He's had problems cuz he's straight and I personally think he hasn't gotten like hasn't had sex enough always seems he doesn't really seem to be experienced with it. He's almost 15 and I honestly think a virgin. I'm almost14 and not. Anyway, well we've had sex like once that was a few days ago He seemed to have a good time. I didn't really cuz he was like I dunno just not content let's say. The big thing is I mean I come on to him and he never wants to have sex with me almost like he's not in the mood. If I offer to give a bj though he'd be more than willing to do it. I know he's not gay but I don't think that is rlly the reason since I'm 13 and rlly there was no difference. I date straight guys sumetimes. But I think I did something wrong. But I mean I feel like I failed and now neglectedsexually like he used me for his own reasons. Anyone deal with this wat should I do?