He said something so mean

My boyfriend of almost a year just told me I wasn’t his best friend. We were sitting on the couch and I was pouring my heart out and told him how happy I was to have him and that he was my best friend.

His response was “yeah I don’t think I’d say you’re my best friend”. And he was so serious. I instantly started crying and he was just like “sorry for being honest?”

Like what the heck. How mean?! Should I dump him