Nothing you can do .. They are both adults.
Regretably they have snared you up in this 'relationship' as hurtful as that is .. And yes .. That is wrong on a few levels because of how it hurts YOU. However, it is not incest as he is not her father or even step father or relative of any kind.
Get on with your life.
It is difficult to go forward while looking
in the rear view mirror.
Stop living in the past.
This is an older question, but since we're there again, I'll throw in my two cents worth.
It happens more frequently than you might think.
It can be reasonable from a psychological standpoint.
It is generally considered "distasteful" by the one in the prior relationship, as well as his or her friends.
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