Should secrecy ever be a part of a marriage?

Several months ago I found out my husband was sending enormous amounts of money to his kids from a previous marriage and relatives (parent and siblings). I keep all of the financial paperwork so I uncovered the excess monetary transfers while filing papers. After reviewing our cellphone logs from the previous and current months, I noticed a lot of text messages from his children. The children were asking for money in addition to the child support he's paying. I confronted my husband about it after revealing to him that we needed to guard our finances, since I had gotten laid off and lost $4500 monthly. We have joint accounts and separate accounts, but agree to discuss ANY large money transactions. Because we have a joint cellphone account he is aware that I can check the cellphone logs. But he placed a lock on his phone to avoid me checking the actual email text. We discussed this during counseling because I felt that he displayed an act of deception and lack of trust. The counselor remained neutral but did explain to him that his actions could be viewed as being deceptive. Well I have not touched his phone until tonight because he asked to borrow my old charger. When I aksed for the phone his expression changed. However when he gave me the phone to try the charger I noticed that he still had the passcode on the phone. I was totally shocked! He agreed in counseling to discuss large money transactions prior to doing so, but I found out on yesterday that he has started doing it again. I'm not sure if he ever removed the passcode or if he did so and placed it on again after making the transactions. He pays child support, dental and medical insurance (even for the adult child), auto insurance (for the adult child), cellphone bills for both kids, and even purchased the auto for the adult child. This really bothers me, really! Any advice?