He keeps saying he isn’t sure what the source of the depression is, if it’s me and our DC or if something else is the cause.
translation: I don't want to directly blame my mood on you as I will look bad so I am just going to suggest it
he says “why do you keep going on about money when our relationship might be lost”
translation: you're a cold-hearted cow who just cares about money, and I am a better person than you
I didn’t want to give up my job and have to rely on him for income because some months he has no work. He said this implies I don’t trust him.
translation: a) the subject of trust has been on my mind recently and b) you are a cold-hearted cow and I am much nicer than you
He made a comment that I am “living in fear “ because I didn’t want to give up my career and move abroad
translation: this is another way in which you are not very nice compared to me
i did remind him that his parenting duties will remain even if he leaves at the time when he was threatening to and he said “See , so I am sort of trapped ?”
translation: another way in which you are not nice is that you made me have children against my will
He is going away on holiday for a few nights on his own later this month.
This is all stuff my exh did/said when having an affair. Made me out to be a horrible person who trapped him. (The attacks distract you from whatever unpleasant thing it is they are doing - you are defending yourself instead of questioning them.) Mine said he was going to therapy/on business trips and in fact went to therapy a couple of times then later just met up with his gf. The "I don't know if", "I'm not sure if" comments were also typical; I think partly because he really couldn't make up his mind whether he was going to leave, and partly because he knew the reasons he was giving were not very believable so didn't want to make them definite claims that I would then question.
Not that yours is definitely doing the same thing. But be aware that a lot of this behaviour fits the Script, so that is one possible scenario to have in the back of your mind. And if he is faithful, having a crisis and feeling depressed - well, on top of that he's also choosing to make unpleasant personal attacks on you and blaming you for his mood.