Thanks all for your insights
I think communication has always been an issue for us. However, before we had children, we didn't disagree very often and/or I was more willing to overlook things. Since having children we're both generally more tired, have less time to talk things through and are more stretched day to day.
Communication has become a sticking point because out of us I'm the more to the point person. If something bothers me I feel better saying how I feel, working it out, and then moving on.
DH is not the same. He rarely complains about anything instead bottles it up and leaves me wondering what's going on as he can become a bit quiet and "off".
This also means that on occasion when I make a passing comment about a benign subject he'll be very put out as it's perceived as a criticism and will be the "straw that broke the camels back" so to speak.
I then get annoyed because I'm approachable and happy to hear when I'm wrong, and will gladly apologise for my part in a situation so we can move on and be harmonious.
So the round up of this is he keeps his thoughts inside which I find a bit sneaky, and I put my thoughts out there which he sees as moaning.
Sometimes we're able to talk things through but it always feels dependent on how he's feeling which I find irritating because if I feel something I should be able to share it