would you feel bad too?

hi everyone ! So me and this guy are in the same friend group. We did hookup even though we shouldn’t have...well me and the girls in the group were planning an air bnb trip and his birthday is coming up so now that trip is going to be his birthday party. The thing is now he is hesitant for wanting me to go becusse he thinks it’s going to be awkward and we’ll feel uncomfortable. And I get that but I feel so upset because we planned this trip even before his birthday. Now I feel sad because my friends will be going and having fun while I won’t all for a dumb guy I made a mistake with. What would you guys do? Would you guys feel bad?