Why I do't believe in this love thing?

Everyone states to be in love/like the other until some girl wither with hotter body / smarter clueless /submissive comes along. So why do they say "Love" and then cheat, have lovers around but fake the wedding? Every person I met is like that, they claim something and all is around you until someone else comes along.

Why I do't believe in this love thing?
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