Then get a second date. Usually if I'm in that situation - e.g. I'm tired or stressed out on a date - I let the girl know. Not in a chumpish way like "oh my gosh, I'm so sorry about being tired today, I must be boring you." I just say something like, "man, there's so much stuff going on right now, I haven't had a good night's sleep in like 2 weeks!" so she knows I'm tired. Seems to work fine.
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