Some help please

Kylie
So my and my now kinda ex boyfriend have been together maybe a year and a half or so and he is this amazing and sweet guy and i love him to bits he has been there for me more then anyone and he is depressed and has been for a while now i think its the working away and then his ex cheated on him for 4 years so there is trust issues and i have depression and ive been cheated on so i know what its like anyway so right now he has said he is just really unhappy not because of me just in general and ive seen it every time he comes home he is more and more distant from me and is snapping at me alot more and so he has ended the relationship i mean we are still talking and everything just not as bf/gf while he tries to work out what he needs to do to be happy and ive already suggested talking to someone and he doesnt want to hear a word of it so that out of the question at least for now and i just want some advice on what he could possibly do to feel better or what i could do or should do because honestly i think he will just approach this like a cold you know just get some rest and eventually it will go away if you need any more information dont be afraid to ask i just didnt want to make this super long