The one time I've thought a girlfriend was cheating on me I simply broke up with her, and moved on. Anything more would just be pointless and demeaning to myself, imho.
Though, if I knew the guy who did it... depending on how I feel about the gal, a single punch to the face of the man might be in order.... unless he asks me to look over his star wars collectibles.
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I was totally expecting the guy in the video to say "hmm... he doesn't seem to fit", and rip off Boba Fett's arms.
