Ah @rhubarb39 . When I met my now fiancé, I had a stalker ex too. He hit me; and the stalking was so bad that he would wait for me at work, in the supermarket, anywhere I might be. He quizzed people on when they'd saw me and what I was wearing. I had to be escorted to work by police some days; change my hours... it was hell. DP had to know about all of it because, for a start, I was a nervous wreck, and the restraining order didn't feel much comfort. And then because when ex found out about DP, he started threatening him too.
DP was lovely and years on, ex doesn't contact me as much, it doesn't bother me and I'm engaged. It didn't feel like that would ever happen for me... I thought I'd definitely lose DP, because who wants to get involved in all that mess?!
But I will also say that when ex and I split, it was just after we'd been on holiday. I went with the best intentions, to spend some time together, but everything we did felt so wrong. The meals were hard to smile through, the hugs, everything. I had a crashing realisation that I didn't feel the same... and I waited until we got home, and I tried really hard not to hurt him, but I'm sure it did. I'm sure from his point of view, he felt hurt and blindsided and didn't understand why all those lovely moments we'd had together on holiday weren't the same for me... (although he was abusive in a few different ways and I was stupid to stay as long as I did).
I'd find a way to not be with him. Not spending all your time apart from him, guessing his every move, because that's no holiday. Is a hotel an option, if a flight home isn't what you want? You won't have the holiday you deserved now. Your friends will probably do you a lot more good than the sun will, and distance and time definitely will.