... it completely and am still in love with him. I just found out he slept with my sister a few nights ago. She just recently (a week go) separated from her husband (7 year relationship) and thinks she's in love with my ex. I'm completely crushed and don't know what to do. She said part of her hates herself because its wrong but part of her wants to see if they have a shot. I tried bringing up the Aunt step mom thing, as well as the fact that we are sisters, but I don't know what to do. They both have depression issues, alcohol issues, and emotional issues. Am I wrong to be upset and completely crushed? Help?!!?