Namechanged for this as EXDH knows my log in.
I need some hypothetical advice please! I was wondering if it was possible to 'log' harrassment type incidents with the police without actually making a formal complaint/ having them caution or warn him etc?
I split from DH last year and started seeing someone new a couple of months ago. Since EXDH found out we have gone from having a very amicable, friendly split to one where I'm beginning to feel a bit unsafe tbh. He has hacked into all my online accounts, stalked me at the end of my road, got one of his friends to try and visit NewGuy at work (!!) and just generally been very very weird. I thought things had been okay the last couple of weeks after we had a proper chat and I explained he was on the verge of me having to stop all contact (with me not the DC) but then got an email from apple on Wed saying 'I' had signed up to a new device with my username/ password. I asked him about this and he said he was just playing at trying to hack into my stuff, that he found it fun/ a challenge, that he wouldn't do anything even if he managed and generally made it all into a bit of a joke. I told him I wasn't comfortable and he promised he wouldn't do it again.
Well, last night I went to NewGuy's house. After Thursday I wanted to see if he was going to stop with the weirdness so I lied and told him I wasn't seeing NG and was going out with friends instead as I wanted to see if he would somehow 'know' I was actually with NG and I would know he'd been stalking me iyswim (sorry if this is v hard to follow!).
On the way there (literally just before the turning to NG's house, he passed me in his car. He doesn't live very near but is feasible he may have had to drive that way for whatever reason. So that freaked me out a bit to begin with. Now NG's house is quite exposed and open plan, lots of glass windows etc. Around 11.45 we were fooling around on the sofa for a bit then went upstairs. At midnight the doorbell went. It took us a bit to get clothes on (sorry 
) and then when NG went downstairs no-one was there. He checked all around the street, in the garden etc and nothing. It really scared me tbh as I was thinking it was EXDH and it took the harassment to a new level really. Then, around 1.30 when I went to go home, my tyre had been slashed 
.
Now, the problem I have is this; I actually don't think EXDH would have done that to me. It's not his style and I just struggle to believe he would. I rang him and he was up (driving), said he'd been with XYZ friends all night and was going home now (I can believe this tbh). He swore on our children's lives it wasn't him. He encouraged me to go to the police in the morning, said he'd pick me up etc. It was NG's EXDW's birthday yesterday so the other possibility is that she came round v. late, saw us on the sofa and flipped. But equally NG doesn't think it's her.
So basically (apologies for epic post) I have no evidence of anything really. Im still not convinced it was EXDH last night tbh, Im really struggling to believe it so I'm loathed to have him be warned even in an informal manner by the police as I'm too aware that he can hurt me (childcare/ financially etc) a lot more than I can hurt him. But, I am getting scared .
Is there any way I can somehow tell the police about this in a confidential way so it's there on record and if it does escalate I've made the first steps?