This happened to me a few years ago. I was convinced about this crush, and I didn’t say anything to anyone except a few close friends, but I prayed for clarity and for the feelings to go away because I wanted to be faithful and to rekindle my love for my partner again. This worked for me! It was very hard, but I made decisions to avoid the crush, and I tried to work on my relationship with my partner, and a few months later it all felt silly and I was so glad that I handled it the way I did.