So I've been dating my gf for a year now, and I am beginning to grow attached to her, however one thing about her is eating me up inside and I don't know how to deal with it.

She is my first gf, and I lost my virginity to her but she has had 2 sexual partners in the past. It upset me when I heard that, especially considering they were never really dating, just friends who were having sex basically. I honestly wish we lost our virginities to each other, but I feel like were on uneven levels. Moreover, the thought of another man having his way with my gf makes my gut wrench to the point that I'm doubting whether I want to be in a relationship anymore. On one hand she is very good to me, but this is something that bothers me more and more as the days go on as I get closer with her. I don't know what to do.

I suppose it's not like I'm getting married to her, so I shouldn't worry about it too much, but it still bothers me.