Katsuki Bakugou

you are his S/O (you choose your gender) you two have been dating for about 3 years and have lived together for a year after highschool it is his birthday doon and yiu decide to surprise him eith a party on his birthday because hes been busy lately and he hasn't seen the bakudquad since graduation so you call them up to surprise him but while organizing all of this he gets suspicious but the wrong idea and thinks you're cheating on him