Condom broke šŸ¤¦šŸ¼ā€ā™€ļøšŸ¤¦šŸ¼ā€ā™€ļø

Me and my bf have been together for over a year and our sex life has been great. About five months ago I got an IUD and we still use condoms. Today the condom broke and before we caught it...well ya know. This guy FREAK OUTS. Iā€™m talking full anxiety attack, to the point the only way to calm him was to take a plan B. Any advice on how to talk someone down from this???