Saw my fiance's ex's old email?

A few months ago I saw an old email of his ex about the ticket she possibly got him to see her, they seem to have plans to get married as the girl had already called herself his "wife" in every email, I felt a bit weird as he would openly talk about his other exes except for this one. What was more shocking to me was she's the same nationality as me, which he reiterated to me before that I'm the first girl from other country he's dated, which was a lie. Does this mean he may have still feelings for her? Or I'm reading it the wrong way? I don't wanna ask him because I feel bad and I don't wanna hurt him or anything as I care so much about him. I'm just curious why he wouldn't talk about her as he's always been open to me about his other exes.

Saw my fiance's ex's old email?
Post Opinion