Longime lurker here posting for some advice.
I met a woman at work 2 years ago and we just clicked straight away and became really close friends. Our lives are very different as she is a LP to teenage DC and I'm 15 years younger and on my own. Despite this we found we had lots in common and I started to go round to hers for dinner one night a week and sometimes more. It was great to have someone I could talk to about anything and it was the same for her too.
Then 6 months ago the DC were with their DF and I was round sharing a bottle of wine and putting the world to rights. As I was leaving she told me she had fallen in love with me and kissed me. I wasn't expecting it and thought it might be a drunken mistake so I left but said I'd phone her. I spent half the night thinking about it and realised that I loved her too. I phoned her the next day and she said she didn't understand how/why but she did love me.
Neither of us are gay, I had a brief relationship with a woman when I was younger but she was married until her abusive husband left her for OW 4 years ago. She was worried about being in a gay relationship, the age difference and most importantly her DC. We agreed to discreetly see each other for 6 months and see how we felt. I carried on going round for dinner with her and DC but as a friend.
The past 6 months have been amazing, we've lived in a bubble because its been secret and only spent time together as a couple on weekends when the DC were at their dads but we make each other very happy. All of my previous serious relationships have been emotionally, physically or sexually abusive so it was something of a revelation to be with someone who is just kind and supportive. Her XH was violent and EA and I know she felt like a weight had gone that we were so happy. Of course we argued but without anyone being bullied or hit.
It may be TMI but the sex was the best I've ever had. I remember early on we were in bed and she looked at me and said 'I've never had sex with someone I've been in love with before' it made me really
but I don't think I had either.
Her DC are both lovely people. They have their issues but knowing the things they saw between their parents as children, I can't believe how they are. Obviously they have no idea I'm anything other than their Mum's friend but I enjoy talking to them in their own right. Her DD has depression and began self harming shortly after we started seeing each other. I have depression (which largely, I've learned to control) but I've sh'd in the past and I found I could talk to my GF and try to help her understand why her DD felt the need to do that.I also talked to her DD about it and she told her Mum it helped and was like having a big sister. The DD is now having counselling and is slowly starting to feel better. Her DS is older and a teenage boy and we don't talk about much except football and the latest craze on YouTube 
Anyway, last week we were talking about what we were going to do and she has decided that, for her DC's sake we can't see each other any more and I am devastated 
Their DF is racist and homophobic and the DC have been brought up until he left that this is acceptable. DS once described a lesbian scene in a film as 'fucking disgusting'. DD has never expressed any views but obviously she's vulnerable and I remember being at high school and desperately wanting to fit in and I think I would have been horrified to be told my Mum was in a relationship with a woman - I think I would have accepted the situation eventually but I didn't have any additional problems.
In the beginning my GF was really freaked out by not being straight anymore and what other people would think, I think this is also part of the decision. She said that she will always love me but she needs to be single or with a man.
She wanted us to go back to being close friends, but I just can't do that so I asked that we don't see each other at all except in work. I want to convince her that it will all be fine with the DC if we are patient, but that's probably selfish. We couldn't really talk about it because both of us were in tears and I left. I think I'm still in shock because I feel a bit numb.
I honestly don't know how I'm going to get over her because she was my best friend too. I haven't told anyone IRL apart from my parents because I was worried everyone would find out, but now I can't talk to anyone.
Can someone please convince me that its definitely over and then tell me to stop moping?