<human>: Five years ago, about a year into our relationship, my partner and I were living in different countries for a few months and going through a rough patch as a result of that. During that time I developed strong feelings for another girl and kissed her on a few occasions. We never had sex, and it was physically very awkward, but the emotional attraction felt real. I had no idea if my relationship would last, and part of me hoped it wouldn't so that I could be with this person (or some other person) instead. 

Fast forward to today, my partner and I are getting married in five months. She's my best friend, I love her more than anything else in the world, and this is basically the only secret I have from her aside from typical male fantasy stuff. I've thought many times about admitting what happened, and I wish I had done so five years ago. Now I'm worried that admitting it would open up all kinds of trust issues and make her second guess our entire relationship. It was "only" kissing, but it was also five years of deception. I feel awful about it. I keep picturing myself thinking about it while we're saying our vows to each other and I get sick to my stomach. There's also the fact that she has trust issues dating back to her mother abandoning her, and the fact that she was cheated on in her relationship previous to ours.

Should I come clean and tell her? Would that be totally selfish and only serve to transfer my bad feeling onto her? Or is that still the right thing to do after this many years?

Can you condense the text into a few key points?
<bot>: I love my girlfriend, we're getting married soon, I'm considering whether to tell her I kissed someone else early on in our relationship, pls advise, thanks