Brief back story. Been with DP about 18 months. We both in late 40s and divorced. He works away in a position where he is for 6 weeks and then is on leave for 6 weeks. We don't live together and see each other mostly only on weekends as he lives a fair way away. He does his own thing in the week when he's off, which is not a lot, golf etc. This past holiday season he was off and his leave was extended so it's the first time we have spend lengthy time together
During the holidays things were good but since I got back to work there's been a few niggles. I put it down to not being used to spending so much time together. I have been single for 5 years so it has taken some adjustments, the usual having to consider another, not just up and doing what you want etc.
The past 2 weeks have been quite stressful. First concern was that he had a go at me because we are both on a whatsapp group, and I posted on there and he got the huff because I didn't say hi to him personally. I was at work and just replied to a random group message. We had a bit of a row about that as he was clearly in a huff as I was speaking to others and not him.
Last week another row as I was online and he implied the thought crossed his mind I was chatting to someone else as I didn't immediately reply to him. Got past that one as I basically told him to stop being ridiculous and that I can speak to whomever I want.
But last night was the corker. We were having a chat on whatsapp. All quite normal. My DC came in to talk to me about something, so I left my phone on the side for about 45 mins. When I got back to phone I see he's messaged again, then again with waving emoji 10 mins later. I just reply to previous message and ignore that. Then he sends a long messages saying that it would be nice if I tell him somethings come up and that I'll be back soon saying DC is here etc. I said what must I do, stop a convo with DC to go to the other room to get phone to say I'll be right back then carry on with DC. Yes he says, it's called communication and he was sitting looking at his phone waiting for a reply for 45 mins.
Well to say I lost it is an understatement. Said things that he didn't take well, like I can't sit on phone 24 /7, I do have 2 dc and that things happen and I will reply when can. Nope this wasn't good enough and this has gone back and forth in a very heated argument since last night. Tonight he is still bleating on about I'm causing drop in communication, it's only courtesy for me to tell him if I can't talk... Er..
So I knocked the conversation on its head earlier. Said I'm done. Then he messages that he loves me and I just reply with a good night. Then the barrage of messages continue as I didn't say I love you back. I see he's just send an audio, apparently I song I sent him in June saying he misses me 
He always has to have the last word even though apparently he no longer wants to discuss it, then continues to message about the same fucking thing!
I told him he's smothering and behaves like he needs 100% attention. So now I've attacked his character apparently.
I came out of an emotionally abusive marriage of 20 years so I thought I was on high alert for issues. So now I am and I'm saying I don't like it and he's taking offence. He says I'm overreacting as I, yes me, could have fixed this in 2 secs last night by saying I'm not going to be able to chat for God knows how long when DC needed me. Do you think I'm overreacting as I just don't fucking know anymore.