I wasn't sure if maybe I was being too harsh or petty, so all your comments make me feel a bit lesser of a lousy friend myself. Anyway some extra details and answers to your questions: I've lived abroad for a few years now, but due to constant moving around, I haven't been able to really form a decent group of friends. One of my last birthdays no one I invited showed up as I happened to be sharing the date with two other people from the same groups, but whom I was not good enough friends with to hold a joint party with, and all my guests split between the two. One of the next ones I only told a select few, who I then considered to be my friends and promised me 'a nice lunch at least', and then bailed. My BFF knew all about this, and knew how big of a deal it was for me to finally maybe be able to have a nice day. Of course, I understand that life goes on and I can't except people to just turn up when I want them to, which is why I tried to plan this a month in advance, the date being in talks for ages now. When the discussion came up, his date was still being decided on. And, yes - it is his birthday party as well, not just a party. However, he is celebrating his over two days, and could pick a different weekend as well (which was in cards, apparently), but chose not to. I, however, am restricted to that one day due to only having a couple of holiday days. And no, I don't think 'just two months' means that the relationship isn't serious, but I do feel that under the circumstances I should have priority. She made it clear it wasn't a difficult decision, which is, perhaps, what upsets me the most. Yes, we are all adults. No, the date wasn't sprung on her out of nowhere and no plans were set in stone. I only get to see her a couple of days a year (we talk more often, of course!) and they get to see each other if not daily then at least weekly. I don't take her to be a person who normally just bails or forgets her friends, I just think she's new to this whole situation and I don't think this necessarily needs to mean the end of our friendship, but I can't help but feel really hurt by this whole situation. I just never saw this ever being an option with her.

Hey OP here. For those that have given support or made a joke, it's much appreciated. It's really helped to see the brighter side of the situation. For a little more back story; I was in his office originally looking for an envelope and found the underwear in the back of one of his drawers. We discussed it at length, I tried to make sure he felt accepted and not judged. It has helped our relationship more than I could have thought. I always wondered if he was holding something back, it's relieving to have everything out in the open. I did a little research and have found that it is common among men. As for only finding one, he showed me his 'stash' of bras and lingerie that he had hidden in his shed. Hopefully he'll be more open and honest with me about what he likes and what I can do to please him.