I am in love with a woman in a relationship?

Well unless you are a primate, if you can't be friends with the proper social boundaries, the you need to stay away all together. do you really need people to tell you what the proper thing to do is? You are on the rebound and in your mind every woman you meet will seem like your soul mate, grow up and join the human race and be responsible for your choices. If she feels a relationship with you is better than her husband or boyfriend wait until that relationship is severed.