TDLR at bottom

About a few weeks ago I went to an event with some people I was familiar with except for one person despite being in the same organization for awhile. I forgot his name because the organization is big and we rarely talk. We only have mutual friends. 

At that time I didn’t know there were two people with the same name. I only knew one person with that name out of the two because I talk to them a lot. Let’s call them Bob 1 and Bob 2. At that time I was only familiar with Bob 2. 

So we’re in a group and a friend calls me to ask where Bob 1 is at but I thought she was talking about Bob 2 because that was the only Bob I knew of at that time. 

And so I ask the group, hey where’s “Bob 2”, everyone got silent and I didn’t know why. I told friend, “I don’t see him, he’s not here.”

No one said anything to me about it but Bob 1 never says hi to me or smile at me anymore and gives me a dirty look. Just bad tension between us. I didn’t find out I made a horrible mistake until two weeks later while talking to one of my friends that’s close to Bob 1 and she starts talking about him. I told her what happened and she was indifferent to it. 

I just hate knowing I hurt someone’s feelings and don’t know how to make it up to up to them. I want to apologize but not sure if that would cause even more drama. I ABSOLUTELY HATE confrontation. What do I do? Do I just accept this L and realize he’ll probably always hate me? 

TDLR :

I asked for person 2 in a group setting with the same name as person 1 not realizing that person 1 with the same name was standing next to me. I know person 2 because we’ve talked several times before but not person 1 because we never really talked before. I think they hate me now, what do I do to make amends?