<human>: Can you condense the text into three sentences or less?

I'm male
We are both 19

Last night was a bit of a blow to my relationship of almost 3 years. My girlfriend over the last 2 weeks has had a yeast infection, so she took the OTC cream. At the end of that, she noticed she still had symptoms and did a WebMD check and she thinks she might have Chlamydia. She admitted to me last night that during the week we had a falling out ("broke up"), she slept with her coworker. 

When we got back together, she didn't disclose she had slept with him, only that she had kissed him. Today we went to Planned Parenthood and I got a full STI screening (urine and blood tests).

I really don't know how to feel right now.I'm angry she put herself in danger and myself in danger. She also betrayed my trust. I know we weren't "together" during that week but it hurt enough knowing she kissed the guy, let alone slept with him unprotected. To top it off, she lied about sleeping with him. She told me yesterday that she felt ashamed and wanted to bury it forever, so she never told me. 

Now, for my wrongs, after we got back together I started reading her texts in secret. It's not my proudest moment but I digress. The guy is a sleazebag and it's apparent she is far beyond over him from her texts and her talking about workplace happenings. I don't fear of infidelity from her. 

So r/relationships, I really don't know how to feel right now. She seems genuinely sorry for everything and I'm not as mad as I should be. I really do care about this woman and I want to forgive her and hopefully the tests are negative/treatable and we can just bury this but I don't know... It's so awful knowing all of this happened, I need some opinions.

Please no (dump her (unless you can back it up with good reasoning)/deleted facebook/hit the gym) type comments.
<bot>: Girlfriend failed to disclose a unprotected fling during a break-up and now she thinks she may have gotten chlamydia. I'm not sure how to feel about the situation