I 27F have been dating a coworker 31M for 2 weeks

So, I 27F have had a very flirty relationship with a coworker 31M for around a year (give or take). We were both in relationships, both recently ended our relationships (me 3 months ago, him 1 month ago). It was clear before we broke up that we both felt the same way about one another. Immediately, he tried meeting up with me when he knew I was out with friends and began texting back and forth. We met up twice, had a date, slept together (multiple times) and then both had a talk that it was very soon after our relationships for something serious but we were not going to date elsewhere and both going to take it slow with each other. To make it clear: he came onto me, he initiated the conversation about dating other people, he asked if he could come and meet me, he asked if we could take it slow, he was on about a weekend away with one another next weekend.

Well, the issue is he was VERY hot and cold. He would text me constantly one day then the next be completely short or not even talking at all. I would see him in work, he would flirt and talk about what we’ve discussed on text / when we’ve seen one another. One of my friends who knows him text him when I was having a bad day, she was completely out of touch and out of line because it was not relevant to him and he was understandably upset - as was I. And from his response (or lack of) I was really triggered and asked him for some clarity as I was unsure why he was so hot and cold constantly. He basically freaked, cut all ties with me and told me that I was moving too quick, demanding answers and that all of this was too ‘heavy’. He then phoned in work sick today and tomorrow as he knows I am also working these days. Now I’m really confused as I have read my text back and I really do not feel that I was demanding and do not feel I was out of line. He always says he’s mentally not able to deal with this, his relationship breakdown has meant his ex partner moving 30-40 minutes drive away with his son. I understand how difficult this has been and have been nothing but supportive of him and his mental health - I too have suffered with my own mental health and have lots of external problems ongoing (such as problems with my ex, mum has cancer, stress of work).

Do you think it was too soon to have that conversation? Am I to blame for him taking sick leave? What was the issue here or is it something else entirely?