What would I do if I were you? Personally, I'd drop it. I'm not convinced that it would reassure you.
But I'm not you. This is something that you have to decide for you.
All I can really say is this. Whenever someone asks if they should try something, I think there are two questions that must be asked.
1. Will it do any harm? and 2. Will it do any good?
In your case, the only harm I can see is that it will be frustrating for Adrian. I think he's really trying to regain your trust, but doesn't see anything he says or does making an impact.
Will it do any good? Only you can answer that, Rachael. Will it really put your mind at ease? That's not a rhetorical question. It's one that needs consideration, and only you can figure out the answer.