<human>: So my girlfriend and I are both just finishing our second year of college, and have been dating for a little more than six months. Besides a few not serious relationships in high school, she is my first real relationship. She had dated a guy for a month at the beginning of freshmen year (of college), but once again, nothing serious. 

A few months ago, we were talking about old relationships, nothing serious, just basics like who they were and why they ended. She brought up the guy she dated freshmen year, and being curious, I asked how far she went with him sexually. 

She said they never did anything more than make out, and she ended up breaking up with him cause he was pushing for sex too fast. 

We talked about having sex when we first started dating. I was open with her that I think sex was a part of a full and healthy relationship, and wanted it in ours.  She said she wanted to take it slow because she has never gone further with a guy than making out. I understood, and was more than happy to respect her wishes and take it slow, as long as we were gradually working towards sex. 

6 months later, we hadn't gone further than her giving me a handjob and not wanting me to return the favor. I was cool with the progression of our relationship until today. 

Today I learned that she let her first college boyfriend eat her out after their first date. 

I don't care that she let him do it, I'm angry because she not only lied to me, but the reason I was ok with taking it so slow was that I thought she had never done anything sexual before.

She doesn't know that I know yet, and I'm going to confront her tomorrow when I see her, but do you guys think I'm over-reacting? Any advice is also much appreciated, thanks.

Can you condense the text into three sentences or less?
<bot>: Gf lied about her sexual history, I care about the act of lying to me about something so important, not the fact that she actually has a sexual history.