I have a big crush on this younger man!

Well, first you need to decide if you want to stay with your boyfriend. If you do, then just forget about the 2nd guy. If not, break up with him.

So, if you see the 2nd guy, make casual conversation and let him know that you don't have a boyfriend any longer. That should get the ball rolling.

Well it depends on the age difference and if you already have one great guy then what makes you think you need this other guy that just showed up? You probably don't, that's all.

I don't think your issue is trying to find out how you can meet this other guy without making yourself look bad. I think your real issue is, do you even want to be with your "steady" boyfriend. Because from the looks of it, your relationship is anything but "steady". That seems rocky as hell to me. Figure out that one first.

Well if you are planning on dating him with your STEADY boyfriend then you are two timing.
1. That's wrong and
2. There is no other way to put it.