Why do people hate seeing Sophia Smiths with Liam Payne?

They are not like this to other couples. Nobody feels upset when other actors or actresses being with their girlfriends/boyfriends, they only hate Sophia Smiths. Why don't they let Liam Payne happy with her?
Update: Sophia is not a whore, and if Liam was not happy with her, he would break up with her and let her be unhappy if that is all you want.
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