Why stay with someone when you have a wondering eye?

A friend of mine cheated on his girlfriend recently with I must say a stunning girl, he also told her that he fancied her and flirts around with her when we are all together. He also follows loads of half naked girls on TikTok. Makes me wonder if he has any respect towards his girlfriend and perhaps his not sexually satisfied with her and his eyes are starting to wonder else where?
Why stay with someone when you have a wondering eye?
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