Girl's Behavior

Should I tell him I slept with his friend before we were together?

So there is this guy I've liked for a while. We flirted a lot and even made out a few times, but nothing ever really came of it. In spending time with him, however, I met one of his friends who just happens to live in the same apartment building as myself. While the first guy and I stopped hanging out, his friend and I started doing things together (not romantically, just as friends) but one day I was really drunk and he brought me back to my apartment and started kissing me. I'm not attracted to him and told him I didn't want to do anything but he persisted and I was drunk enough that I didn't really protest too much. After that, I stopped hanging out with the friend all together, and it's only recently that I've been willing to spend time with him again. Fortunately, it hasn't really been that awkward.

This past week, the first guy (who I really, really like) and I ran into one another and realized that the reason nothing happened between us before was that neither of us was willing to put ourselves out there and we were both afraid the other didn't like us. One of the first questions he asked me, however, was whether the friend and I ever slept together. This question was asked over text message, and I didn't feel like explaining everything to someone who (at the time) I still wasn't sure had feelings for me, particularly over text. So I said no. Now, we're planning to get together next Tuesday. We're not a couple or anything, but I really feel awful for not telling him the truth. The guilt is bothering me a lot (not to mention, I don't want him to find out from someone else) but I also don't want to ruin our first date or bring up something too heavy right away. I don't know what to do. Any advise on what to tell him and how/when to broach the subject would be much appreciated. Thanks!
Should I tell him I slept with his friend before we were together?
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