is he too young for MLC?

[Dom R]

I told him I couldn't do that. I can't just be his friend that sleeps with him.

Sometimes, that is what is required, for a recovery for a while. As long as he isnt being with anyone else, would that be so much of a problem with you?

Trouble is... based on his explosive reaction on "why are you keeping secrets" question, he may well be involved with that woman.

i asked him if he could talk to me about this and what was it that changed so fast? he is sort of texting me back right now and accusing me of the things he is doing. I'm not keeping secrets, he is. And about stupid stuff too. I am really confused today.

sounds like he's going fully into "cover up and get defensive" mode. you wont get anywhere with him, when he is like this.
Pushing him for "why are you hiding things?" will only drive him further away.

you might want to just let him cool off.
then another day, attempt an olive branch.

oh.. and dont forget to talk to the "friend" to confirm whether she's done dating your husband or not.