A few days ago,my girlfriend of 3 months told me that about 10 years ago,she had a one month lesbian relationship. I was shocked and didn't know what to say.She tells me it was just an experimental thing and that she is 100% straight. Our relationship is going very well both emotionally and physically. For some reason,I can't seem to get past this and it has been bothering me for days.She said she regrets telling me as I have suddenly become more distant and aloof. I don't know what it is, but is really affecting me in a negative way.We have talked about our past "straight relationships, but this was a bit of a shock.