I don't really know how to reconcile this with my conscience, but I'll just lay it out.

I have a lovely girlfriend who is barking up the marriage tree and I believe I would probably be content with her. But, long story short, I have for a very long time been infatuated with her younger sister (don't worry nothing even close to illegal). My girlfriend and I have been dating for almost three years and it hasn't been a problem until recently. I have started talking with her sister much more, becoming friends, hanging out, etc. because it is a bit of a travel to their house and often times my girlfriend is busy, so I just hang out with her sister.

I think I am falling in love with this girl. I think about her all the time. I simply can't stop. She has a boyfriend, and it is fairly serious, but it is a very very long-distance thing for them.

I don't know what to do. I know I will always feel terrible if I never do anything about this... but the risks are so great. I could lose everything. I don't think I could stand that.

I don't know what to do. I am honestly getting desperate. I've never felt even close to this way before.