getting back together

call me stupid but today he have to go to parent teachers conference for his twin girls.and the baby mama going to the thought of them in the car together makes my skin crawl…one big happy family im thinking in my brain..should i be so paranoid and suspicious..i been with him for almost 3yrs and i know if he was like i want u back she would take him back in a heartbeat..but so far he never went that route…should i think negative of all of them together today?

get back your ex