Am I doing the right thing?

I was seeing this guy and even fell in love with him but all he ever wanted from me was some fun and nothing serious. So I eventually gave up and gave someone else a chance.
And today I see my exs status saying that you can't trust everyone that likes you because you never know how long it can last, I know it was directed to me but I don't understand why he always acts like the victim if I've been waiting 5 months for things to change but it never happened.
My own mother told me that if I don't let go I'd end up waiting my whole life.

Do you guys think I did the right thing?
Am I doing the right thing?
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