I have been friends with a woman for 11 years. We are both lesbians. She really liked me, more than I was ever aware but I just ignored it as I didn't feel the same. Ive always said to myself I would never go there with a friend. When she was with her ex she would always joke that Id had my chance, which always baffled me because I just wasn't into her in that way. 
For me, it has never been anything more than a friendship until recently. I have been single for a year now, doing a lot of soul-searching and growing up. I have previously only dated arseholes. She's just found out her DP of 5 and a half years has cheated on her and isn't in love with her anymore. Devastated is an understatement. I feel truly horrible for her!
This has really come out of left field for me. While she is really pretty, I have never been attracted to her until she told me about her ex cheating.
In the space of a day, I have gone from not ever wanting a relationship with anyone,(ex was EA) much less marriage or children to thinking about her nonstop with every daydream scenario you could think of. Where the feck has this all come from? It is literally like someone has flicked a switch on in me. She is lovely, kind, deep, beautiful, has a career, and is very loyal. Things in the past that probably would have bored the pants off me. I know she accepts me for me and Ive never had that.
I have no plans to tell her any of this. It is completely unfair to her and the heartbreak she is going through at the moment. I don't know if Ill ever tell her. I just was wondering if anyone has had a situation similar to this with a friend that they've developed feelings for. Please help! I have no idea where any of these feelings have come from!