I don’t know if you’re aware but gamcare do have a support line that is open late, maybe 24hrs. If things become unbearable it may help to ring them.
It may help you if you can record his violent and aggressive behaviour, as well as keep the texts just in case you do end up asking to get him sectioned. Gamblers are the masters of deceit and manipulation as you know.
I’m getting ready for work now and really wish I could be more help to you.
Hopefully another F+F user will see your thread and offer you some useful support shortly.
Take care.
Geordie.