He's asking to be 'mummied' though, isn't he? Telling you he felt 'faint and dizzy' and then had an upset stomach? If that happened to me, at, say, a friend's house, I'd just make my apologies, go home and have a lie down, not describe the symptoms!
Sorry garlic but he's sounding more and more like a man-child. I was married to one and had very similar treatment when he left. He wanted to 'stay friends' (because all his had abandoned him) and kept phoning to ask me to go to the pictures with him, or what should he do about a bill? I so desperately wanted to stay friends (and for him to come back - was I mad??) that I kept up the 'friends' thing for a few weeks, until it dawned on me that he was using me as a substitute friend and thus stopping me from moving on.
Beware the knocks on the door asking your opinion on things, telling you things (like the mum-to-mum phone call) that he should be sorting out. He's leaning on you. But as soon as he has his feet under him, he'll be off and running, so don't read anything into it (like that he's regretting his decision). Separate. Detach. Leave him to it.