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So starting with some context. My younger brother (23) and I(26)are really good friends apart from being siblings so usually we talk to each other about everything. His now fiancé (20?) and him have been together for a little under two years in a mostly long distance relationship, only actually having spent at most three months across those two years together in person. They’ve never lived together either nor have plans to any time soon since she studies in another city and my brother lives at home with our parents.he also has a history of being quite impulsive in his relationships taking huge steps quite early on.

Yesterday my brother called me on FaceTime at 4am after a night out. I happened to be awake, so I answered the phone and he was pretty drunk. I thought it’d just be some goofy story or something. But he then flips the camera and shows his girlfriend has a ring on her finger, and exclaims “I did it”. Now this was really awkward cause I assumed he was joking at first. He’d not told anyone about his plan to do this, which is kind of strange. He’d also just gotten home so that just added to my confusion. Who proposes drunk, in bed after a normal night out? Anyways I had to fake my enthusiasm partly because I was shocked, quite tired and a bit worried. Usually I guess 2 years might be normal, but when you’ve only spent a few random days and weeks together across those years, never lived together, I feel like this is quite impulsive and a bit silly. he should’ve at least waited until they live together, because in the grand scheme of things they don’t really know how it’s going to be when they spend months and years together. From my experience, you don’t really know how a relationship works or if it does until you do live together for a while. I don’t know, maybe I’m being an asshole but I just feel like this is a bit crazy. Also a bit of a heads up, I don’t really like his now fiancé,mostly cause she never really tries to fit in with anyone except my brother and she generally just has a off vibe. like maybe that could influence how I feel about his whole thing, but I don’t know.
I haven’t told him about that though cause it’s not actually that big of a deal.

Anyways I plan to tell my opinion about this whole thing in a respectful and careful way. to explain how I want him to make the right choice and for him to be happy, but I’m just worried that this might end up being a mistake and he’ll regret it or if he ends up hurting this girl cause of an impulsive decision. I truly do want the best for him, if it does work out, great! But from his previous patterns in relationships, i fear that it won’t. But I need an outside opinion, so what do you guys think? Am I the asshole here? Is this kind of crazy?