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bang bitches while she's away

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Very good point. You should be out banging bitches anyway. You have the rest of your life to be monogamous. Enjoy as many sexual partners as you can while you're able to do that without being unethical.

There is absolutely no justification in getting stressed out/bent out of shape over this. She's not your wife, nor is she even a long term girlfriend, so you don't have much invested in the pot at this point.