@Mumbunmum - it's good that you have the house sorted, and that you've had legal advice about staying in it, and I'm REALLY sorry to keep harping but if you have money in that joint account, and you haven't already done this, get it out NOW and put it somewhere else [different bank]. Change direct debits if you need to (and are able to) but safeguard your money.
You say you've no trust in him now - take that to the nth degree. Assume the worst at every turn. You no longer know this man, he no longer cares about you.
The message probably doesn't mean he is missing you, to be honest - it's just him realising that you might not be the soft pushover he thought you would be, so he's making an effort to "keep you sweet" before he does something else completely heinous (like empty the joint account).
When mine fucked off, he called me one Friday and made it sound like he was missing me, thought he'd made a mistake etc blah blah - I was going to a friend's for the weekend and made the enormous mistake of believing any of his shite! - but when I called him on the Monday to see what was going to happen, he was fully back into the new relationship and it was like a bucket of ice water going all over me.
Momentary doubts get sat on VERY quickly in their heads - along with any feelings of guilt - because, as I said, they REALLY don't like to be made to feel uncomfortable. So at its best, that message is to reassure himself that you're not suffering, so he doesn't feel guilty; and at worst, it's hugely manipulative to make you think he still gives any kind of shit about you.
And yeah - now you've read the Cheater's Script, you can watch it all play out. They all think they're sooooo original, yet they all stick to it.
I agree with the nonsense of "two sides to every story" - again, that's just him telling people his re-written version of events to make himself look better. Anyone who believes his shite isn't worth bothering your head about. You truly find out who your real friends are at this point, and that can be hurtful too - sometimes it's the most surprising people, ooh, like your best "friend", for example - but also you might be surprised about who stays in your corner. Beware of male people staying in your corner though - a percentage of them will be thinking "opportunity!" - best avoided.