Need to vent.. boyfriend moved out

We been together for 11 years next month.. he is a very jealous person. Long story short.. I took my son to get a hair cut and a coworker showed up at my cousins:.. I was confused when I seen him cause he look familiar then it hit me that he was from work.. so I said hi and introduce him to my boyfriend.. that was it:.. when we left my cousins, my boyfriend got mad and said how many men did u send to your cousins... he packed and left:.. I didn’t even know he knew my cousin..