I would not believe a word that comes out of this 'mans' mouth. I doubt that ALL the instructors know and are happy for them, sounds like bull to me. I doubt the senior officers know, more like the minion ncos.
also he would have needed permission from his reg CO/OC to be doing this cadet stuff, CRB checks etc so informing the reg CO of his behavoir should get his permission taken away so no more cadet stuff for him
Why did you move out of the MQ? if he has left you then you can stay for a min of 6 months ( he has to pay ) and only when you are officially separated (on JPA records) can you be asked to leave by the army, again with time to find a council property if required.
Is he still in the MQ? he should be in the block, not the MQ.
Sounds like you need to arrange a face-to-face meeting (if possible) with the UWO rather than just a call.
I know its not fun airing dirty laundry in public, but the UWO will not tell those that dont need to know.
Im guessing/hoping that you want to leave this manboy behind you and move on to a better life, so you do need to get a few things sorted than dont apply to civi divorces. The UWO can run through all of this with you in detail. (such as CSA out of pay, and divorce options, as said before go for the pension as its worth far more than civi women know)
You do need to go 'armed' with evidence of his affair. any emails/text from him reference money, admitting cheating/being with this girl.
The army welfare service will be able to help you with any questions you have before you go in with the UWO
www.army.mod.uk/welfare-support/family/1153.aspx