Ex didn't get why I wished he came out?

I still have feelings for my ex. I feel like we are not done in many ways. since bu which was 3 months ago he has initiated contact and then we talked and had sex a few times. I also had to see him for 3 weeks straight. eveey co worker saw how we kept looking at each other. They said it's undeniable that there is still something there. i asked him to come out to friends birthday party last night and he said he prob couldn't because of a work dinner. I later on texted him about wishing he had come and be didn't understand why. I just told him I was leaving soon and asked what he was doing but I know he prob fell asleep. Should I say sorry and maybe just ask to hang tonight and or talk and see how it goes? I need to lay it all out on the table and tell him. It's so confusing. how do I go about this?
Ex didn't get why I wished he came out?
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