Dear Caitlin №7: My BF is seeing his ex behind my back. Do I have the right to feel disrespected?

Dear Caitlin,

Dear Caitlin,

I have a boyfriend that thinks it’s ok to hang out with his ex behind my back and just recently he went to a fraternity event and ended up taking pictures and slow dancing with an old friend female of course while I’m at his house waiting for him to come home. Am I overthinking or overreacting to this or do I have the right to feel disrespe…