<human>: So I got drunk yesterday and cheated for the first time in my life. I slept with another man and now I feel like shit about it. My gf has been out of town for months and is coming back to town in a couple weeks. 

Apparently testing for all of the diseases at planned parenthood is optimal after 3-4 weeks. So naturally I can't sleep with my gf until I get tested which means I need to tell her.

I have already broken up with her once a year ago and went out and had sex with people for a few months before eventually getting back together with her and I feel like this is going to hurt her more. I want to tell her over the phone today (as she is still out of town) with the least amount of damage to her or our relationship.

Condense the text into a few key points
<bot>: cheated on my long time gf while she was away and I need to tell her so I don't put her at risk for std's given the testing window