Moving out/Spare Room to rent in Dublin?

I don't but out of curiosity how close is close?

Hopefully be within a 20-30 minute drive from the city 

He started going out with his now fiancé in about 2014. They got engaged early 2018. The wedding date is set for this time next year. She basically moved in more or less as soon as they started going out. I’ve been a third wheel for a while but it’s always seemed basically okay and neither of them seemed to have an issue, mostly because we’ve all always known it wasn’t permanent. 

I’ve always been clear that I’d be looking to buy a place of my own well before the wedding, and be gone at least three or four months beforehand, if not longer. I’ve never had any indication that any of that was a difficulty. I have the guts of a decent deposit now (almost 20% of what I’d be looking to buy, with a bit of help from the folks) but being (a) self employed and (b) single, it’s tough to persuade banks to lend me enough money to actually buy a place, and I haven’t really started looking yet. 

I was out at a quiz this evening. I came back at half ten and her car wasn’t outside. It turns out that they’ve had a massive row, she’s staying with a friend, after threatening to move out, and the gist of it is that she wants me gone, seemingly f**king yesterday. There was absolutely no warning this was coming, not to me, at least. 

Am I meant to move now, rent somewhere else, pay a heap extra in rent compared to what I’m currently paying, assuming i can find somewhere, delay my own ability to buy a place, and basically throw money down the drain, primarily to appease her? Am I meant to back down as part of an argument I wasn’t even part of because she won’t talk to me about it? It seems to me that if I moved out ASAP, frankly I’d be rewarding her for the adult equivalent of throwing her toys out of the pram. I don’t want to cause any friction in their relationship, but what the f**k am I meant to do? It’s already happened and it’s already a far bigger issue than I had any idea. 

My mate is understandably stuck in the middle but I don’t really know what he wants - like he says, I shouldn’t be made to feel like sh*t, and basically unwelcome, in what has been my home for over seven years, but that’s exactly what it feels like. I’m stressed as f**k right now. It’s not his fault at all and I know I should be taking more steps to get my own place, but what the f**k am I supposed to do? If I move out now and rent somewhere else, I’m basically costing myself loads of money, all to protect their relationship, because she can’t wait a few more months, and I get this sprung on me with no warning whatsoever. Gaaaaaaaaaaaaah. The longer I stay, the more it seems I might jeopardise their relationship, and I definitely don’t want to be responsible for that. But if I move out, I’m giving in to her blackmail, and for what? My mate isn’t going to ask me to move out now but it seems he might be under pressure to ask me to move. There’s no doubt he’s in a tough position and if I move out, it would be to help him, rather than her. 

I almost want to pack my stuff and go now, but make sure she knows I think she’s a thundering bitch. I can’t even sleep I’m so f**king stressed. 

A) move out and cost myself a fortune in extra rent, delaying my own ability to buy a house 

Or 

B) potentially f**k up a relationship between my mate and his fiancé, but only because she has thrown the toys out of the pram, without any warning

At 8an or 11pm.