I was with my ex for almost three years, he was my everything. He was my only friend. We would always fight over who I talked to( as in guys). He was also very controlling. I honestly wanted us to last. But the accusations weren’t worth it anymore. So I gave up. I dumped him and blocked him. He’s met someone else and I can’t seem to stop checking his social media to see what he’s been up to. Do you think I really loved him or that it just hurts that he’s moved on?

That sounds like an unhealthy relationship, and you did the right thing by leaving it. But few things in life are 100% black-and-white. Having feelings of sadness and pain after a breakup is NOT evidence that a breakup was the wrong choice. 

Stop checking his social media - block him even harder if that’s possible, enlist a friend to help you break this habit, take a social media fast - and give yourself the time it will take to heal from this. It’s okay to have complicated feelings, it’s okay to need time to feel better. Focus on what makes you happy right now.