Okay so this might seem trivial but caused a disagreement between me (37m) and my partner (39f).

Driving along a dual carriageway in the UK with partner and 3 kids. Up ahead around 200 yards the road is becoming 1 lane with a queue to merge. I'm in the outside lane so still moving slowly while the inside lane is already pretty much standstill.

A car on the inside ahead of me darts out into the outside lane moves ahead about 5-6 cars then merges back into the inside which pisses me off. As we slowly go past I glare at the guy to demonstrate my disapproval. My gf gets pissed at me and says he might not have realised it was becoming 1 lane. I call bs, he knew exactly what he was doing.

What do you think? AITAH?