I don't think that's correct, if you break the contract the landlord will use the deposit to fund the shortfall.
Don't be another bad tenant, in future don't break the agreement or damage anything then there's no excuse to withhold the deposit
Go see an agent, it will cost you 12,500 per year, maybe more if you haven't got a Bangkok Bank account. If you're in Pattaya i can recommend one, i think they can help people outside of Pattaya also.
Plus fire the wife
The friends thing is a nonsense for me on Facebook anyway, I'm not interested in photos of food and what's going on with people i hardly know, so i unfollow, but Facebook is good apart from that