I am so sorry that he's being such a pain. If you have not seen a lawyer, you need to get one and fast, i.e., especially if he is withholding money for the kids and bills. Do not put this off! He needs to "pony up" his share of expenses when it comes to the kids.
He is also projecting on to you what he's either doing or thinking of doing, i.e., having an affair. No, it's not strange, they do project on to us what they are thinking many times over. If he wants to jump up and get the milk, then so be it.
As for questioning you about your phone use...I wouldn't even address that w/him. He's just trying to pick fights w/you because he's just not a happy camper these days.
Please see a lawyer about those bills and expenses. You shouldn't have to foot them all on your own.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
