Long story short, my girlfriend of 1.5 years (18F) is contemplating leaving me (18M) for a 30M, who divorced his wife after claiming to have fallen in love with my girlfriend when she was just 14.
He was her personal trainer at that time and she claims they fell in love after 6 months of friendship. She also says, that he played with her feelings and manipulated her during their affair.
Her parents are in the picture and made sure he spent a year on the other side of the world after his divorce.
During this year she was absolutely heartbroken and this was of course also affecting our relationship heavily, though I didn’t know the reason at the time.
In October she told me about all this and claimed to have finally come to terms with it, after meeting him coincidentally.
In December he started reappearing in her life because they have similar hobbies and to her surprise her feelings for him reappeared.
On New Years Eve he reached out to her and she’s now contemplating leaving me for him.
All of my sadness and disappointment of this aside, I am worried sick, because this seems clearly unhealthy to me and I simply don’t know how to help her.
Can I even help her? If so, how?