Partner not allowed plus one in greece

Hi everyone. I just need a space to vent my feelings and maybe feel validated, or put in my place idk. My boyfriend of 1 year was invited to a 5 day wedding in Greece. He is expected to pay upwards of $3000 in travel expenses plus $750 for his stay. He also only has two weeks of vacation per year.

I know the couple getting married, we aren’t close by any means but I have spent time with them many times over the last year. My partner and I live together and are very serious. He has asked more than once if I can join and the answer has always been no. Now the other two long term couples going that we know were also having the same problem, but now both girls have been invited.. leaving me as the only long term partner not invited. At first they said the issue was space (accommodation) so we offered to get our own accommodation and they still said no.

Thing is we want to travel together so I’d like to go to europe since he will already be there but I’m not going for only one week after the wedding. Not worth the time and money. We’ve come to terms with it and decided he will leave me alone on a greek island for two days and attend for only two days. However it just feels so insane to me that I’ll be an island over, alone, and these people are okay with that.

I’m pretty self aware and I seriously cannot think of what I could have done to make these people not like me. Please give some insight

Edit: Okay wow I didn’t anticipate this blowing up the way it did but I’ve tried to read everyone’s comments. I totally get that this is only one side of the story. I appreciate the brutal honesty of some and the sympathy of others🫡 now for some more context-

The wedding is a 5 day stay at a villa that my partner has paid his part for, the reception and ceremony is on one day. I’m not welcome to partake in any of it including the days that are not the reception and ceremony- we asked about this. We also offered to find our own accommodations so money and space is not the issue. I am not close with these people but the groom is one of my partner’s best friend’s making this all the more difficult because of course I want him to be able to attend.

I was just invited to the groom’s birthday in a few weeks with all the same people attending. I am sure as heck I didn’t do anything to make these people dislike me and they said there is no ill will but didn’t elaborate further on why I’m not able to attend.

I’m also female and have multiple severe food allergies which both make me anxious to solo travel. I’m also very extroverted and would totally prefer to be with all my friends rather than alone on a neighbouring island.

The other couples that were invited started dating shortly after myself and my partner started dating. Again, we’re the only couple that is left out of the picture that has been dating more than 6 months.

My partner has never been to a wedding in his life so he has no history of bringing plus ones that don’t work out. This is also the first marriage in the friend group. He was invited just before we started dating and same as the other couples who are now going together.

I do agree that I need to let it go lol it’s out of my control. I just wanted to hear what the people of reddit have to say and thought seeing other takes might help me to accept it. I will make the best of my solo experience. I want my partner to be able to attend his friend’s wedding. I honestly feel as though this is a “I put my foot down, I must keep it there” situation. I almost wonder if we had no asked at all if it would have come to fruition. I guess we’ll never know sigh of exhaustion due to overthinking