You've got a camper van in your garage? No wonder he wanted to move into such a comfy billet from which to play his violin worm his way back into your affections.
Of course it's scare tactics - he's failed to jerk your chain in any other way. In the absence of any documentation to substantiate his assertions, he hasn't got a legal leg to stand on and this latest salvo is merely more of his tiresome bluff and bluster which you have become increasingly familiar with of late.
There's no need to panic, no need to rush to reply, and absolutely no need to consider making him any offer whatsoever except of the 'bring it on, see you in Court' variety after nit picking protracted correspondence has racked up his legal costs.
In the highly improbable event that he'll be found giving oral evidence against you in a court of law, I'll alert the press and hire a charabanc for mumsnetters to jeer cheer his arrival at, and/or departure from, court with a rotten fruit and egg salad.
On the strength of this I suspect he's back with the ow, who'll be eagerly planning how to spend your money, and I wouldn't be surprised if you receive more texts from Ms Sleazylay her in the near future.