About 12 years ago I met my now best friend who is female 38 and I'm a male 43. For about 8 years we were more friends of friends type thing.. The last 2 years we started hanging out together alone and a lot. We literally consider each other best friends. She would literally come to my house and sleep in my bed three nights a week innocently. We spend every holiday together every birthday every special occasion . She had just gotten out of a relationship that ended badly . One night we both drank a lot and one thing led to another and we started having sex. A couple of minutes into the sex she jumped up and ran out the door and said this was a mistake. We both agreed to not let that happen again and we went back to being good friends. Well a few months later the same thing happened again only this time she didn't leave until after sex was over but then still said the same thing that it was a mistake. Again we just continued to be good friends. This has happened three or four times in the last 8 months. Well, needless to say Im in love with her now. I express my feelings to her and she says that she's still in love with the guy that broke her heart 8 months ago and that she can't be with me because she has such strong feelings for him. So we went back to just hanging out as friends and she continued to sleep in my bed and we continued to spend holidays and birthdays and everything together. Her kids absolutely love me her whole family wants us to be together but she continues to tell me she just wants to be friends. A week ago I sent her a text on her way to work and said hey just wanted to let you know I was thinking about you and I hope you have a good day at work. She responded by telling me I wish you wouldn't think about me so much. I was like wow okay a few hours later she messaged me and told me I can't be what you want me to be and I'm going to meet and have sex with my ex. I was pretty pissed for numerous reasons. But mainly because he treated her like shit and he currently has a new girlfriend and he just wants to use her for sex. But also because I almost felt like she was cheating on me. At that point I said to myself this is unhealthy go be with him but I don't want to be a part of your life anymore. She texted me later that night and said I'm so sorry I never went to see him please don't shut me out I feel terrible. She said I do have feelings for you and I've been fighting those feelings because I have feelings for him too. She said I want to try with you. She said can I please come and stay the night with you so naturally I said yes. We didn't really talk about anything we just hung out like normal. She slept over that night and left early in the morning. A couple days later we talked and I said I really can't handle just being your friend it's like torture being around you and I really want to be in a real relationship with you. She said I'm sorry I have feelings for you but I just don't know if I can ever be that for you. She said why can't we just continue seeing each other like we've been and not label anything. I explained to her that it was torture having her around half the week and not actually being with her. So today I told her I think it's best if we stop seeing and talking to each other that it's not healthy for me to continue. I don't spend any of my free time with anyone but her ever. I've turned down multiple women because all I wanted was her. I'm pretty sure I know what I need to do and that's to cut her out of my life but I was wondering if anyone else had any advice. She's extremely sad about all of this and so am I.