Having experienced having to recover from a broken relationship, I recommend watching this through to the end...
https://www.youtube.com/watch?v=mHjJcp_je2k
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If you guys weren't such an emotional rollercoaster it wouldn't bother you that much. If a girl cheats you should do the right thing and fuk every friend she has. Don't drag your knuckles and start crying, realize it's a green light to slide inside multiple orifices