Is he using me?

Hey girls I've never posted before but I've been thinking a lot lately... I've been speaking to this guy for almost a month, I'm 15 (nearly 16) and he's 17. We met through a mutual friend and we have gotten close recently. Last week we decided to have sex. I took his virginity but he didn't take mine (please don't comment on having sex at my age, I believe sex is a personal thing so there is no right or wrong age to have it). Anyway so ever since we had sex, it seems to be all he wants to talk about, he is very sexual while we are texting and I'm starting to think, is he just using me for sex or do you guys think he is just talking about it a lot because it's new to him and he's excited? Thanks in advance! xxx