Why the weird behaviour two months on?

ok we had a row.he insulted me,I let it go,he plays games with him and I play games with him..so on for nearly ten years.I let the insult go and we were getting on fairly ok..we work together.We both went through a kind of upset stage cause we really (well I think anyway it was mutual) liked each other and yes there were underlying feelings.Then yest I am outside talking to a mutual female friend of ours,an elderly lady and he comes over and sits on a seat right in front of us(garden furniture).She says hello to him,he says a couple of words back,looks at me,then sits on the seat and completely turns his back to us.Now he could have even sat sideways,its a circular seat,but no he turned his back and sat alone there right in front of us.She even thought it a bit weird,but she doesn't know about the row.He went through a phase of being nice to me,then basically ignoring me,then we were workmates kind of again.I thought we had turned a corner.What gives?This behav is not like him at all

Why the weird behaviour two months on?
mayb you should ask him so sit near him and say have i done somthing wrong .. but somtimes sum ppl get like tht .. so mayb you should let him come to you but i think you should ask what have i done wrong .. or go out there and speak to him or somthing .. try and start a conversation and get things normal again .. good luck