Hi, I'm new here, but very familiar with your previous girlfriend's silence. You say she should have told you, which would have to indicate she knew and understood her condition. Not many JW's get actual clinical help with depression or bi-polar disorder. She just could not have understood how her moods related to her. She also might not have been on appropriate, if any, medication. Without it, life really sucks for manic depressives. She also could have been misdiagnosed - it happens frequently (I know, I've been through that one.)
You were right, though, if you would have married her and her condition was not under control - your marriage probably wouldn't have been either.
I am 50 and a woman. If you go to any gathering where we are allowed to dance, you will find that the man who can dance, especially fast dancing, will always shine with any and all women present. I always told my sons that, but most men are so afraid to move their hips!!!
Listening to a woman, dancing, (if the Society will allow you), and funny always work. You don't have to be gay to be funny and move your hips! I swear that's why a lot of men like to be around gay men - they're funny!
Good hunting for a mate......