No offense, but what's suspicious about this? The most I can get from this is that she may have arranged for the schedule to work out that way because sex hurt and she's scared to try it again. Especially since we don't know the amount of pain she was in, or any real details about what the circumstances of their first time were. It's unfortunately not uncommon for girls to have very painful first times, especially if their partner is also a virgin or simply inexperienced. Add in muscle tension from anxiety, and some misinformation from **** (natural lubricant is more than enough, just shoving it in and thrusting is perfectly acceptable, women always climax from penetrative sex, bigger is better, etc) and it could have been very badly executed and made her very wary of having sex again- especially if she didn't reach ******. Telling someone to basically abandon ship because the relationship hit a bump isn't something that should be promoted. It isn't healthy for anyone involved. OP because they don't face the fact they may have issues in regards to sexual performance and because they didn't even bother trying to mediate; and the girl because she had sex with someone, hopefully because they both wanted it without coercion, but instead of it being a pleasant, happy experience, she apparently got pain, the usual grab bag of health issues that can go with sex, and then gets dumped without even an attempt to investigate. Not really the best scenario there. The appropriate thing would be to sit the GF down and talk to her about the sex and what hurt when, then offer to work on fixing that if it's possible. It would also be a good idea to ask her why she took the shift she did.

I'm fairly sure the "Smells fishy" comment was not suggesting that it was suspicious, but making a play on words about going down on a woman. However, I could be wrong.