I have a very good friend, who i have known for about 8 years. She is a lovely person and we're really close but when it comes to relationships she is a real screw-up.
When I first met her she had a long-term boyfriend and a stable if dull relationship. They then split up and she declared she was a lesbian and immediately started a relationship with a woman who had a girlfriend and really messed her around for about a year. They split up and became a virtual recluse for a while. Then she met another woman who also had a girlfriend. This relationship had a rocky start but the woman did leave her girlfriend for my friend. They had a relationship for 3 years but it was very up and down and they split up once, reconciled briefly and then split up again permanently ( and unpleasantly) a couple of months ago.
My friend has now decided she's straight again! And is seeing a married man she met through work. He says he's in love with her and she claims not to have any expectations of him. I think she's just heading for yet another disaster. What should I do, if anything? I feel upset about seeing her foul up yet again but I don't know if she will listen to anything I might say.