<human>: I heard there were some sadistic bastards around, but I don't see a lot of proof of that. I'll start.

When I was 13 I had a girlfriend that had Epilepsy. She had never had a boyfriend before because of her condition and the fact that children in middle school (USA) were weirded out by her. Also, she wasn't attractive as hell, but she didn't look bad. I was from a different school, didn't really care, started dating her, and she came to trust me a lot, and I let her. One day at her house she invites her best friend from down the street to hang out with us. Naturally, we play truth or dare. As an awkward teenager, this was probably not the best game to play with a girlfriend of four months and her hot friend, but I wasn't about to NOT play. I mean, come on.

I was trying to play it safe and not seem like I was attracted to her friend, so I kept picking my girlfriend to choose truth or dare. It quickly gets to the point where I dare my girlfriend to get naked. She bowed out, chose truth instead, game kept going. I start running out of things to ask/dare my girlfriend, so I start picking her friend to do truth or dare. I wanted to see her naked, at some point I dared her to do it, she quickly stripped butt ass naked in my girlfriend's room. Later that week I broke up with my girlfriend who trusted me enormously to start dating her hot friend. Like an idiot, I thought honesty was a good idea. I told her it was because her friend was willing to get naked and she wasn't. They stopped being friends. I got a hot new girlfriend and me and her never talked again.

Can you condense the text into three sentences or less?
<bot>: Broke up with very trusting epileptic girlfriend for her best friend because girlfriend wouldn't get naked during truth or dare. Told her it was because she wouldn't get naked.