Should I continue with him? What should I do?

So me and this guy liked each other 3 years ago but it went downhill. But we have always remained friends after that. So He had a gf that he dated for 8 months And they've broken up, he told me about it and now we've been talking to each other daily since the ending of June. We send each other nudes and stuff and go to the mall together and out to eat but I think maybe he's using me as a rebound, or like using me to get over her or something,  which if he is, that would suck because I like him and I'm kinda scared to talk to him about it because he might not be over his ex. He also calls me his best friend with benefits. Should I continue talking to him? Am I his rebound? Your opinions on this? 😥

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