How do you know when to cut the cord on someone you are talking to?

I met this guy on tinder, we have been talking for a couple months and both discussed wanting a relationship. For context ( we’ve never met never sent nudes)
I’m not saying this is bad necessarily. But I feel he isn’t serious about us and I don’t know if I should pull the plug. I did like him when we first talked and we called once and it lasted a couple hours with a lot of chemistry. But it feels like things have gone dry before they have begun. He told me he’s depressed and struggling with motivation and so on in life which is why I’ve given him grace and more time and patience. But now I’m wondering if it’s worth it to wait it out and see where things go or if I should cut my losses and end it.
What do you think?
How do you know when to cut the cord on someone you are talking to?
Post Opinion