Morning Trinny love, Bigmama is right, sound advice. Yes, you do need closure on this relationship once and for all, the only thing with texting is that it always leaves it open for reply, have you considered writing him a letter stating how you feel toward himm, pointing out exactly what he has done to you and your children, the cowardly way he behaved, his audacity for contacting you considering how he has behaved etc?
If it was me (and this is just me) I would write it all down,everything, then leave it for a while, return to it and rewrite it without the anger -clearly and to the point, and finish by stating that I will no longer acknowledge any contact by him. Wish him a happy life then tell him to fcuk off (ok, the last bit was just me!).
Just hold on to thoughts of your future and that of your children, never forget all the things he has done but draw a line under him and them, and start afresh.
Love and hugs
warpig xxx