I have been with my husband for 10 years. When we had just started dating he had introduced me to one of his good friends, and I was instantly crazy about his friend, he was just an amazing person. But I had just started this relationship with my now husband, and his friend didn't really seem interested anyway. My husbands friend has been kind of MIA for awhile getting his career going, so I kind of forgot about the feelings I had for him and went on about my new life with my now husband.
10 years later.....this guy is back in our lives, and my feelings for him are stronger then ever. I am most definitely in love with him. It is literally making me sick how crazy I am about him. I think about him everyday, and feel myself pulling away from my husband. For the record my husband is an amazing man and father, I do love him, but I am completely in love with his friend. His friend has no idea how I feel, and I have no idea how he feels about me. Do I just live with this anxiety and desire to be with him and stay with my husband, or do I follow my heart and risk losing everything?
If it's any help from an ancient old Brit with a similar issue, that is nearly sorted by folk in here, plus more issues, work as hard as you can to keep your marriage intact. I went through several affairs, love not in frame, pure lust and male ego, but I did at one stage nearly leave my wife and two kids after a very serious 8yr love affair with her best friend.
I wish you luck, it's not easy but it can be done.