Is NOBODY wrong in the post ? POST : Hello, please be gentle, I'm struggling.

I'm in the process of recovering from (relationship) OCD and I've recently reduced my meds meaning I've had a surge of intrusive thoughts. I've been practising not responding to them for a year and as a result, I now can no longer trust my gut instinct - if I react negatively to something, I am convinced it's because it's my OCD so I let it slide. I really want to know if I was snappy because I'm irritable, or if this is actually a snappable offence. 

So the incident. 

Boyfriend and I had plans to go to his (our) friends house for tea after we'd both finished work. He was already there when I arrived.

Our friends are a couple, Sam and Julia, and when I arrived and sat down, Julia asked me how my sick pet was whilst she was preparing food. I start talking about it, it's been a bit of an ordeal, vets, money, thinking he was dying, and my boyfriend just starts talking to Sam about the board game he's brought? So I briefly stop talking because I find it hard to concentrate when other people are talking, and carry on, only for boyfriend and Sam to continue talking about the board game. 

I turned around and said "I'm talking, can you not talk over me?" and his reaction was an indignant "alright!", and him and Sam continued quietly in the corner.

So instantly I apologised, thinking \*oh my god I've done it again, I've oriented to an intrusive thought, him talking over me was fine, why have I done this\*. 

But as time went on, I just felt like shit, and I left 2 hours later. I wanted to explain this to him, but also didn't want to bring it up when really... I just want to know if I was overreacting. There's no point in talking about this incident with him now, but if the same thing happens in future, I can at least know whether my reaction is appropriate or not and can work from there.

TLDR AITA for snapping at my boyfriend for talking over me?