Im rather young for this type of situation, near 21 but leaving vague, but Ive been in a relationship with a girl for nearly 3 years and things were rough to the point I was excluding or being excluded by friends and family by extension of me being around her, and we have 2 kids together. This all isn't the point though as we broke up a bit before the second was born and have had a rough time since but have been close. Now the important part. For most of this time I've had a crush on her sister that I haven't been able to get rid of no matter how hard i tried and she perpetuated to the behest of my ex and her family. It turned into what I can't deny as love or obsession a bit ago and then my ex caught on a bit and we had to cut contact, she's since moved away a few months ago and my heart hurts and all Ive been able to do is suck up to my ex to not seem guilty. Please help...