Aquarius (M40) depression

My boyfriend, Aquarius (M40), has been deeply depressed. Quit their job almost 6 months ago, struggling financially, and isolating themselves from friends and family. They have become irritable at everything, trouble sleeping, spending all day smoking weed and drinking. I am deeply concerned about them. They don’t like asking for help. I have helped financially and doing activities with them to help them keep their mind of things. Kindly encouraged applying for jobs by doing it together (I feel like he feels better when he feels productive and has a routine). I really need some advice on what to do here. If anyone has any tips on how to reach him I would appreciate it. I love and care about him so much and desperately want him to be his happy self again. Thank you in advance everyone :)