Have NC for this.
I have been separated from DH for about a year, just to get that out of the way. The thing is, in the past year I made a gay female friend. No big deal, have many gay/bisexual/varied friends, fine. But I suspect this one may be flirting with me? And I feel happy about that, but also I feel like I'm being deranged because I can't be sure. I feel like a childish teenager sometimes. I have had little crushes on women (never had a relationship with one, haven't even kissed one!) but this one is different, it feels like an actual sexual tension and attraction.
Men are very obvious and blatant, are women the same? This one is very funny and kind, and I know she is like that with everyone else, but there have been a few moments where I thought it might be more than 'banter'. I really don't know if she feels like same as me, she has made some comments. For example, the other evening I was going out with a friend and I asked her what I should wear. She said the navy dress. I said I don't know why you like that one, it's awful. She replied with "Quite right grumpy, I'm sure it looks much better off than on ;) " and I was like 
I didn't say much back, because I was afraid to (I wanted to, though). Do you think that's a flirty comment or am I reading too much into it? I never encourage these comments by the way, I'm very reserved on text and messenger and things like that, so I don't think I have courted it.
She is younger than me (her 31, me 40) and so I can't fathom why she would want to flirt with me. So I suppose the ridiculous question is how do I know? I've never been in this situation, I don't know whether my hormones are playing tricks on me or whether I'm full on midlife crisis. Any ladies who have flirted with other ladies have any tips? What should I look for? Am I mental? 
in person she is very reserved, more so in person than via text, maybe a confidence thing I'm not sure. Help!