It's great you are not a jealous person! You must know what you want to know and why.
There should be point at which you will trust him to sort things out with Helen himself. You both can get worn off from snooping and mistrusting pretty fast.
Is he planning on getting a new job?
I'd probably say something in the lines of "I'm sorry I snooped. I realize I want to trust you and don't want to be left wondering." Then I'd ask whatever there's to ask including changing his job. But that's coming from me, a jealous person, I'd rather him switch his job and deal with his ex without involving me than him having to reassure me every other day. If anything, that does not look pretty.
Anyways, I hope you won't have a row over that again.
Are you busy with wedding planning, or have you got most of the things done?