My boyfriend’s depression is starting to take a toll on me too...

My (30F) boyfriend (31M) is depressed. He tries to push me away. I try to give him space but checking on him every now and then to let him know he is not going through this alone. He is not sleeping well and thinks alcohol can help with that (he is an occasional drinker). But last night was different because he said he will drink all night to get proper sleep. I love him so much and I am so worried about him. Now my thoughts are consuming me too. The “what ifs” keep on coming. What if he wants to give up our long term relationship? What if he continues to drown himself in alcohol? What if he does not acknowledge he needs help? I am also losing sleep and appetite. I wanted to be strong for him because he has been there during my darkest day as well. Any advice on how can I support him and myself in this trying times?