I have a friend I like very much we used to be work buddies but then she moved away but we’re still in contact

Lately I have been very depressed and she is the only person who said “you can call me anytime, you can talk about anything”

I talked to her a few days ago for over 30 mins, I felt so much better, I am very grateful. I talk to her once or twice every month

But I should find other distractions in between and not feel like a burden

I also want to tell her something positive some day and not just this

Can anyone give me some advice