I am working on a project with a team of three (my team lead, me and one of my peer). My team lead is very experienced in the field and vastly knowledgeable. He is very dedicated and committed to the work and very effectively distributed work among the three. If we had any problem, I consulted with him and he managed to solve the problem with ease. I had no problems working in this team for three months.
But suddenly, he contracted Covid and was out of office for one month (his whole family was quarantined). During this time, my peer and I had the manage all the work. My peer is slightly less experienced, so he had difficulty handling critical task, so the task was distributed 70%-30% (70% was me). I was burned out and literally overloaded with tasks. I sometimes contacted over phone to discuss the progress but he was not in shape to talk about anything. I was hoping he gets alright.
His quarantine period got over and now he was starting to come to office. He got slightly lethargic and was not in best of his health which was understandable. He didn't work too much for the initial period and all the work was done by me and my peer (but at least we are lucky to have his presence). But as time progressed, we noticed a slight change in attitude. He became lethargic and was not fully committed to work. He developed a bitterness in the way he spoke and sometimes he seems to zone out. He didn't work as he used to do before he contracted Covid. The work distribution was imbalanced (almost 50%-35%-15%, 50% being me). He always throws work at us saying "you are grown up now and can handle task yourself. You don't need help from me. I am busy with other task" but he is not doing anything. Even if we ask for some help or need some clarification, he becomes snarky and say that this is so simple and we can't even solve on our own.
I tried to talk it off (politely and not straightforward) but he always brush it off and say that I don't need to bother about him and focus on the work. I can't complain as it would seems like I am sabotaging my team. He is way older and senior than me, so I am in no position to argue or confront face-to-face.
It's been four months. I was hoping he would recover from this but it seems he is not. How should I proceed?