I think I can understand why Joe exploded. I don’t excuse it, but I have a short fuse that I’ve got well under control these days, but there was a time when I did not.
Firstly driving a couple is annoying to many people. I know for me, it’s very annoying. I’d never allow a couple to sit in the back seat while the passenger seat was left unoccupied. That just would not happen, I’d have said the second both of you were going for the back seat, “Is this a limo? No, well then I’m not a chaffeur, one of you get up here.”
But I have no problems being blunt and expressing what I want and how I want it.
Most of the time when I’ve been in these situations I’ve actually been in a relationship, but nonetheless I get very annoyed at seeing others get lovey-dovey. Especially in an enclosed environment where I can do little to stop it. Now, you’ve said you don’t make out in the car, but has he ever been in a room, somewhere, anywhere, where you made out in front of him and he didn’t really have any viable way to get out of there?
I know in one thread people called me basically an ass because I’m not comfortable watching people make out. But I think that as a fellow human being my personal comfort about a semi-sexual situation should be taken into account. If I’m in an enclosed setting my friends shouldn’t make out in front of me since they know it makes me uncomfortable. Obviously there are situations where I can just “wal out” and ignore it, but I’ve been in many situations where I could not.
It’s possible Joe has been in these situations before, and it’s probably caused mounting resentment/annoyance. So even the smallest thing when it comes to being in the car is magnified, a kiss, holding hands, conversation centered away from him et cetera.
As it is though I think there is some innate problem with a 3 person group like this. The person who isn’t banging the rest of you is instantly the “minority.” Everything is going to be centered away from him, despite perhaps occasional exceptions. Basically in this situation I understand why Joe got pissed, as he’s probably suffering from mounting annoyance at feeling slighted.
It’s not the most rational reaction, but I can understand it. However I don’t think you and your fiance should have to do anything to fix his feelings. Tell him he’s your friend but also you should tell him you and your fiance aren’t going to take ridiculous measures to appease his irrational annoyance/anger/resentment.
The solution for Joe is to widen his circle of friends, get a SO or at least start dating. Should Joe “move apart” from your fiance? No, they are best friends. But he shouldn’t have his whole social life based so heavily on one other friend, it just isn’t healthy to be so dependant on someone. Not for him, not for your relationship, and not for your fiance.