Apologies if this is a long post but I'm at my wits end with my friend and not sure how to handle it anymore.
We've been friends for nearly 15 years so I knew her before she got married to now ex husband. They were married for 10 years and have a shared daughter who is now 9 but 4 at the time of split. Towards the last few years of their marriage there were clearly some problems, I think my friend (after losing quite a considerable amount of weight) had new found confidence and prioritised spending time going out socialising or the gym and they never spent any actual time together. He was left apparently to do most of the household chores and caring for their daughter and he got fed up one day and walked out. Things got worse over the initial first month after as it became apparent my friend had cheated on him on 2 occasions, (this came out after he went to pick up daughter a week later and saw this man in the house whom she had been seeing for the past 3 months in secret).
Anyways, roll on a further few months and her now 'ex' husband was with a new lady in a relationship, so quite soon after and my friend became convinced he had been cheating on her also. I have no idea what the truth is personally but it seems that may well have been the case. Both as bad as each other if you ask me and clearly wasn't meant to be.
However, and this is where my problem is, my friend has made 'being cheated on' her entire personality. It's gotten to the point now where every time I see her, which is usually at least once a fortnight, that she mentions it in some way or another. She will make videos on social media slamming her ex too which makes me feel uncomfortable. I get how hard the change in lifestyle has been for her and I do sympathise, but it's like she's forgotten what she did too, which is cheat! I can't stand double standards at the best of times and it's now beginning to turn into a huge resentment which I just can't seem to shake. I just want to shake her sometimes it's driving me mad. I want her to be happy and try to encourage her to see the positives in her life every time, but she always brings it back around to her ex husband and how he has it so easy, he's taken all the money blah blah. I have no idea what to say to her anymore.
Does anyone have any words of wisdom on this please?