How can I be there for my depressed boyfriend?

I have a wonderful, caring boyfriend who i love so much. He has been saying lately that he feels numb and depressed. He has been feeling a bit bored of life for years, but it has definitely took a turn for the worse. He sometimes takes it out on me a bit. Nothing abusuve or anything, just a bit critical and cranky and is pulling away a bit. I feel like im too short with him and not patient enough and im not sure how to help at all. Now he's going out of his way to act cheery around me and i feel like that is going to exhaust him. He owns a bar and works in a super small kitchen 24/7 which isn't helping him but he can't afford to sell it or start a different business yet

I want to show him that im there for him but also not suffocate him or bring up the depression too much. If anyone has any suggestions to be supportive for him can you please advise? I want him to feel like he has a teammate in this

How can I be there for my depressed boyfriend?
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