Long time listener first time caller etc.
Last year I managed to get two tickets to Coldplay's Mylo Xyloto Tour. My friend who I was going to take with me was ill and couldn't make it, and I didn't want to waste the other ticket. It was short notice so I invited my neighbour "L" (who I USED to get along with very well) because I knew she was a big fan, and because I didn't want to go on my own, and didn't want to go to the hassle of trying to sell the ticket.
FWIW the concert was great. But a few days later another neighbour across the road told me that she thinks she saw L kissing my then-DH a few weeks before. Now I don't have any proof of this, but in hindsight L always had a certain look in her eyes every time she saw him, and I remember one time he helped her fixed a leak with her kitchen sink, and now am wondering if that's all that happened. My neighbour (the one who told me about the whole thing) is usually very truthful so I believed her. I'm 90% sure they kissed, which is as bad as full on cheating in my book.
Long story short I split up with him (not because of this, for other reasons including other infidelity, but it certainly contributed), and now I'm very frosty with L, as you can imagine. As she's my neighbour I can't really avoid her. But one day we had a big row after I'd had too much. I asked her to pay me the money for the ticket. She couldn't believe it. I told her that if I knew what she and my ex had been doing, then I would never have taken her to the concert, and in a way she sort of accepted the ticket under false pretenses. In a way I partially blame her for the break-up, and I feel she owes me at least the ticket price which, if I had known, I would have given to a friend.
She's flat out refusing, and saying that I'm mad (but crucially not denying that she kissed my ex). But I'm not budging.
AIBU?