was i a good friend

My friend was struggling. They were stressed, depressed, and anxious - not a good combo. I didn't realise how bad it was at the time or how to help. I did my best at the time to be supportive and remind them to take care of themselves. They started getting more distant and 'busy'. I thought they were losing interest in me and in anxious moment, I basically called them a bad friend. They were sorry and said they didn't deserve me. I tried to take it back but it was already said. Over the course of a week we went from talking every day to not at all. Since then I've tried apologising, calling, messaging to let them know I'm here and care for them so much, that I miss them and still want them in my life. But it's been 4 months and my last message wasn't even opened. I'm worried about them and fear our friendship is over. It hurts. I blame myself. And I feel so alone now. Can't stop thinking about it.