Seeing someone since early October (we are in a bubble as both live alone), we get on really well and both feel we have a connection. He made his intentions clear from the start that he wanted a relationship, and it felt like we were working up to that.
We had an argument around a week ago which wasn’t really resolved.
On Wednesday morning we spoke and I said I wasn’t sure how I felt about everything, so I said I’d give him a call on my lunch break at work (which I do quite often as we have the same lunch breaks) and he said he thought we needed some time apart to decide if we want to continue.
I asked him to clarify what he meant and he was quite off with me, and not talkative. I mentioned I thought it would be better for us to just meet in person and discuss how we both feel, he blew me off and said possibly next week and that he’ll let me know.
It’s been 4 days now and I haven’t heard anything from him since our conversation on Wednesday - usually we arrange which days we will see each other over the weekend based on work schedules, and speak every day. I have a horrible feeling I won’t hear from him again 
Am I overreacting to be worried about him ghosting now?