you just say bring it on
They will have a ring on their left ring finger (finger next to pinky on left hand).
Well it sure sounds like he seems interested. Does he smile or do you have spinach stuck in your teeth? Ha, ha. Seriously, if you and your girlfriends feel he is interested in you why don't you chance asking him out. If you don't try you will never know, and the worst that can happen is he will say no or make up an excuse of some sort. We've all been there ourselves.
Good luck Marcy
Depends how old you are. If you aren't at least in your teens you may never get a kiss from her.
Each girl is different and usually "the eyes have it." If she looks into your eyes dreamingly at a given moment when you are alone this is usually an indication that she's ready for that kiss.
You're boyfriend is to blame ... his ex should have no reason to be seeing him when you aren't around. He can form the word "NO!" Don't listen to "but we're just friends" because if that's all they were then you being there wouldn't be a problem. You can't blame your boyfriend for doing anything sexual because he might not have, but it's time to lay down the law and tell him it's wrong and if he doesn't stop seeing her then you're kicking him to the curb! Mean it!