1. When you're theoretically capable of having a girlfriend, but somehow you'll never get one

2. When you travel back in time to somehow prevent your ex-girlfriend from rejecting you, and the action removes any reason for the travel, along with any knowledge that the reason ever existed, thus removing any point in travelling in time in the first place. See Hitler Paradox as well.
1. John: Dude, everyone keeps saying that I'm the kind of guy who can easily get a girlfriend, but for some reason no girl wants to talk to me.

Dave: You seem to be affected by the Girlfriend Paradox.

2. The Girlfriend Paradox is my biggest argument against time travel.
by Idontknowanymorepleasehelp November 17, 2019
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