Definitely get advice from police/women's aid on how to end things before doing anything.
Two stages: 1. You're too ill to go on holiday, but he can go, and if he wants you to change the name on the ticket, to let you know so he can take someone else.
Whilst he's away, get organised - change locks if he has a key etc. When he messages when away, bland, grey rock responses.
Stage 2 is the break up, so he's already had a week or so of feeling that you're not as keen (and hopefully he's shagged someone else, so full of confidence that he'll easily replace you).
My instinct would be not to mention the CL disclosure - he'll paint you a picture of how these women/the police/the courts fecked him over, he's not like that with you, you're special, he's learnt his lesson, he doesn't know what he'll do without you, blah blah blah. You'll be suckered back into it.
Remember you don't owe this animal anything, let alone a truthful explanation or to even listen to 'his side'.