blackwizard said:
Let me get this straight, you found your hypothetical soul mate, the best girl in the universe, everything is going perfectly, then her ex comes back out of nowhere and she starts fuck him again.
Having a SS who loves you and gives you his attention is a huge blessing, and she with these blessings is fucking another guy, probably spitting on any other feelings you ever expressed to her.
And now you're convinced that it's ethically right to separate them, because you would be the best, etc., etc.
If you are the best, why is she now not with you, but with another guy?
Instead of wasting time and energy on these people, find a girl who is seriously interested in you and not using your energy to "have fun" with other people.
My advice is, don't waste time behind an obsession, with half the time and energy you will find a partner 1000 times better.