It seems to me your faced with three options:- (1) Ignore it. I could'nt.
(2) Save the texts, and inform your solicitor, good idea.
(3) Give him a taste of his own medicine, are you going bald? My your hair's getting grey, have you not been well (mock sincerity)? You look awful! You look so old, not George Clooney old but Menzies Campbell old. You're getting fat, another inch on your belly and it'll obscure your 3 inch willy. I did'nt know you suffered from premature ejaculation until you climbed off me, it was only when you'd finished I'd realised we were having sex!