He asked me for coffee, how should I go about this?

Help- he asked me for coffee and I don't know how to go about this?

Long story short, one of my best friends and I have feelings for each other, but it's not all out on the table. I know about his feelings for me because he told my mom, and also told her that he sees me as being way out of his league. He doesn't know that I reciprocate the feelings. Anyway, he had a girlfriend until about three days ago, so I never acted on anything because of that (he didn't either, but broke up with her because it wasn't fair and he didn't see her in his future), and I still haven't because the breakup is still very recent. So we spend a lot of time together, like a LOT of time, and we're been best friends for about 5 months now so he invited me for coffee this week and I think it's becoming more evident that we have feelings for each other, although it's not out in the open so I don't know how to go about this coffee thing... What do you think I should do?? I'm really awkward in this type of situation so I have absolutely no clue.