Do you believe cheating is wrong, or that you can't choose who you love?

People always seem to say "you can't help who you fall in love with" but then get angry at people who cheat and call them worthless, disgusting, etc. 
Can you really believe both statements? 
If you can't help falling in love with someone then wouldn't it justify cheating because you couldn't help it?
And if you really think cheating is wrong wouldn't that mean it is your duty to keep loving the person you have commited to?
Please share thoughts.

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