Crush on ex-coworker and he's asked me out?

I'm 17, and I used to work with a guy probably late-20s, mid-30s. He was always funny and kind to me, always giving advice and working with me to work my way up the corporate ladder. He ended up quitting a little less than 6 months ago, for income reasons. His last two weeks, he got sick, and I never got to say bye to this man who had really helped me grow and I was hard-crushing on. Fast-forward to 2 months ago; I got my promotion! He somehow found out (social media?) and got in touch to congratulate me. He lightheartedly suggested going out to celebrate, to which I equally lightheartedly fed into it, dismissing it, really. Not five days ago, he texts me again to check in; we chat a bit, and he reminds me about going out. I tried to dismiss it again, but here this older man is, asking me to hang out, the very one I've been missing for 5-6 months. We're still trying to get schedules to work out, but I need advice before next week!!! Should I go? A lot of people say it, but I am mature for my age (my parents and teachers and older people have told me all my life). I really want this to happen, but I don't want to be used for sex. My questions are is he really asking me out or does he just want to meet up with someone he sees as a little sister? if he is asking me out, does he just want sex? and should i go? but if i shouldn't, how am i supposed to just... blow him off?

Crush on ex-coworker and he's asked me out?
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