<human>: Been dating for around 6 months, both adamant that this is the deepest we've ever felt for an SO. We are both equally experienced, had a few long-term relationships and a few short-term flings each. We are currently long distance, but moving to the same city in about a fortnight.

For the first few months of our relationship we only talked about infidelity in passing, and I was under the impression that (like me) she'd been faithful to her previous partners. About a month ago though she admitted to me one night that while traveling away from her previous boyfriend of 3 years, she'd fallen for another guy. She spent a week traveling with this new guy while lying to her ex about it, and eventually slept with him. She felt bad afterwards, but never admitted her guilt, and continued the relationship when she got home as if nothing had happened, despite still thinking about the other guy from time to time.

This was all about 2 years ago. Now I love her deeply, and want this to work out, but I think my trust for her has diminished slightly since learning about her past. She recently went on holiday for 3 weeks by herself, and only told me when she'd got back that she'd spent 5 days or so traveling around with a guy she'd met. She promised me that nothing at all had happened and that since he was traveling solo as well, they'd both just been glad of the company. I believe her, but that doesn't mean that the whole situation doesn't make me uncomfortable.

She's a very beautiful, passionate and impressive person, and she will always get a lot of attention from men. She told me jokingly that two guys (including the one she traveled with) 'fell in love' with her on her latest trip. I just can't tell whether I am right to be feeling uncomfortable, or whether she has changed, wouldn't cheat on me, and is being honest with me. Any insight into this would be of great help, though I know it's very difficult without knowing all the parties involved.

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<bot>: gf admitted to me that she cheated on her ex while traveling, and I now trust her less. Am I right to do so, or should every relationship be assessed in isolation?