Is he using me for sex or does he have a little feelings for me? he also has a "girlfriend"?

Okay, so me and this guy have been texting almost everyday. And I lost my virginity to him, and have sex like 4 or 5 times. We're 17 btw. But he has a "suppose" girlfriend that lives far from us. He sees her like every weekend, and hes cheating on her i guess! At our school, he's known as the player, and he's the quarterback for the football team. Well yeahhh, but he texts me as if I was his girlfriend and says you should sleep over and we'll have sex in the shower and can I come pick u up so we can have sex..blah blah blah. He'll also texts smiley faces a lot and says sweet things. He told me that he loves having sex with me, but idk. I kind of have feelings for him and I wanna know if he has some for me. ohhh, and he says stuff like we should go on vacation somewhere. So yeah, is he using me for sex? Or does he actually have feelings for me?