Hello

Some background: We live in a country where mental health is not taken seriously and living outside your parent's house is VERY frowned upon unless you're married, so my friend can't just live alone or go to a therapist with their parents.

The issue started a year ago when my friend's brother and favorite son died a rather horrible death. Their parents took this HARD and started getting depressed. The father started smoking more heavily and even got a stroke from the stress/smoking, and the mother took it the hardest.

My friend's mom used to be sweet and understanding, but right now she just screams at her children and takes anything they say out of context to fight with them. My friend at first was affected by their brother's death but got over it soon after. Then, they started "supporting" their parents by allowing themselves to be their parent's "punchbag". My friend and siblings at first tried to be kind to their parents because they're old and this is obviously hard on them, but right now, all of them are depressed as well. My friend opened up to me about how all of this is too stressful, and how all they do now is sleep, go to work, deal with parents. Rinse and repeat

6 months ago, my contact with my best friend started getting irregular. We've known each other since high school  (but we live in different cities since 3 years ago) and from that time, we chat daily multiple times a day. The first time I noticed how they started replying once a day instead of multiple times a day, all their messages are short or things like "haha", "lol", "ikr". Then, they suddenly stopped replying or reading my messages for 3 weeks. After this, I was worried that my friend was suicidal (they were prone to depression/suicide since we were in high school). That's when they finally opened up to me about what was happening and how stressed/depressed they are. They even became workaholics to run away from their life at home. I offered my friend my support and told them I will be available always.

From that day, I kept checking on my friend regularly to make sure they're okay. 3 months ago, they told me their mom's getting better and their aunts and uncles are helping her with depression by taking her shopping and on vacations, and so on. I asked my friend what about them? and they answered, "tbh I'm about to break down haha". I replied with so many messages about my loving them, how everything will get better, how I'm always here for them ..etc. They said they're really happy and glad I'm there for them. Then, they stopped replying to me. On their birthday, I sent a happy birthday message to them, they replied to me. Then stopped reading our chats again.

My friend used to be active on Facebook as well. They stopped posting there 6 months ago. I have their Twitter account as well. I don't want to come as stalkerish so I didn't send them anything on there because they told me about the handle in the past, but I don't have an account so I never followed them there. They last liked a post a week ago. So at least I know my friend is alive. Note: all their liked posts are about depression, helping parents, finding one's self, loneliness, and so on.   
I just don't know how to get them out of this when they're not even reading my messages. I honestly am worried about them and wondering if their mother is really getting better? or was that a lie to make me feel better? what if they're getting better but just don't want to be my friend anymore because I am too clingy? I just don't know anymore