Db ex wife stole his passport

[School2]

Advice needed!
On Valentine's Day my db and I were due to go for a couple of days abroad for a romantic getaway. In the morning we were both ready to make our way to the airport and were about to call our Uber's from our respective homes. However when db went to get his passport from his home office drawer it wasn't there. He immediately suspected his ex wife as she had been in the house the day before. He called her she denied it. He called me and I calmly said let's not let her ruin our time together so we went to Cornwall for 2 days instead. We had a good time and we are happy together.
On Friday she called him and told him he could come and collect his passport. So she admitted it.

This has made me so angry. I know she's jealous and bitter but who does that sort of thing?! Whats worse is I wanted my db to report it to the police which he has refused to do as they have children together. The children are teenagers and she couldn't stop them seeing their dad as they want to see him. I just want to know what I should do and how to handle this?
I did say to db is crazy behaviour and reporting it to the police would help us to get a restraining order if we ever need one but he's not willing. Should I just move on and forget about it (which is hard) or should I do something?
So confused.

Has he told his mum what his ex did?

I wouldn't remain friends with someone who did that to my child!

I hope he told her he wants absolutely nothing to do with her again. The kids are old enough that he doesn't need to have contact with her.

And he should at least tell her that the kids are the only reason the police aren't at her door right now.

I wouldn´t call the police. It seems like a major overreaction if that is the only thing she has done. I agree with your DP on this one. But I would put a lock on the office door from now on and be very careful about what you leave lying around. Take it as a warning that you have to be more careful with this stuff in future, rather than turning this incident into a major conflict.

I wish it was the only thing she's done! She has damaged his car on purpose and been arrested for it.
This is the only thing she has don't that has affected me though- hopefully there is not much more of it.
I don't like her getting away with it but she knows we went away anyway so she didn't completely ruin it.

Why doesn't he move in with you temporarily (or permanently if you are at that stage) . That will make her plans backfire if he moves out of his mother's as she still goes there to steal his stuff.

We are looking for a house for him to buy, we can't move in together before marriage due to our culture. But we plan to get married as soon as we have a house and we have put an offer in for one so hopefully all goes well and he's out of his mums sooner rather than later.

She sounds like a wrong un. Don't be angry, just pity her. She's pathetic