My BPD partner dumped me help me understand this, please

We werel totally fine enjoying ourselves (one month relationship), had a great Friday evening. Until Saturday morning... we were happily lying in bed, he was on Instagram working as he works as a community manager, when I said as a joke (I swear to god it was a joke) something like "He prefers working than taking to me" He immediately changed her mood and told me he did not want to see me anymore. That that comment made him forget everything good he was feeling for me and that he didn't want to plan his life with somenoe who does not support his job (?) I didn't mean to hurt him. I swear. I don't know what to do know. Can someone help me please?