Bridesmaid’s boyfriend, and rehearsal dinner

So before I ask this, I want to clarify of course my bridesmaid’s boyfriend will be invited to the wedding, and we are NOT having a headtable so they will be able to sit together at the reception. I am fully aware of all this etiquette, but this one particular situation I’m not sure what to do.

We have 6 total people in our bridal party. 3 are single, 2 have SOs that are not attending (they are from OOT and their SOs won’t know anyone so they’ve already told us they don’t intend to bring them), and 1 bridesmaid has a boyfriend who will be invited.

My question is, for the rehearsal dinner, we are only having immediate family and bridal party. I know it is traditional to also invite the SOs of the bridal party, but he will literally be the only one. To clarify also, I have no problem with having him at the rehearsal dinner. I’ve known him for years and consider him a friend at this point, but he is definitely not in the same category as the other people who will be at the rehearsal dinner.

My questioning if we should invite him is NOT because we don’t want him there, it’s just more like worrying that he will feel awkward being the only one who is not immediate family or one of our 3 best friends. (The bridesmaid and her boyfriend are also both local, so it's not like he'd just be waiting at the hotel or anything, like he would just be at home if he were to not come. We are just concerned that he will feel obligated to come if we invite him and that he may feel a little weird being there.)

Opinions?