Replying to Suicide?

So its not me thats thinking about it, its my friend. he had talked about it a year ago and i didnt really talk to him since because we just grew apart no homo.  anyways we started talking again and he was like "yo we gotta chill this summer, cause its going to be a rough summer" and im like "yea sure" then after i realized what he had actually implied, i was shocked that he was thinking about it again. 

ive tried to get him to talk to people, ive tried to get him to take up hobbies, ive tried to get him to go out to parties and make some friends, but he wont agree to anything.  im one of his "best friends" even though we talk like once a month (just to give you an idea of how many friends he has). he is pretty chill to be around and seems to have a happy life when im with him and a couple of my friends, but then he pulls shit like this out of nowhere.  i would chill with him a lot all summer but i have a job and i need to make money for university, plus i have a girlfriend that will want to hang all the other days.

help me out here NS, im out of ideas and id rather not have to go to a funeral by the end of the summer

PS. if you dont have something supportive/constructive to say, gtfo. honestly this isnt the fucking place for dumb shit