TLDR is the title.

I know the title sounds very brash, but let me explain myself. Also note that I do not have depression, so I don't have a firsthand understanding of it. I can only go by anecdotes and literature. And please feel free to educate me.

I (22M) am friends with K (19F). We met on OkC in January, tried to date twice, but she broke up with me both times, after a week. In her own words, she was lying to herself about being ready to date. 

She has had clinical depression basically all her life, in addition to ADHD, anxiety, insomnia, and deep traumas (therapists, sexual, men in general). Deep inside though, she is one of the most amazing people I know. We click quite a bit and share the same humor and interests.

I have never been friends with a depressed person before. I thought getting over my feelings for her was hard, but this is way more challenging. Throughout the past few months, I've just had many doubts over whether or not keeping this friendship is worth it.

She describes her depression as wearing a mask constantly, that can never come off. I've hung out with her 5 times, and she's always expressed how she had a blast, but it's quite emotionally draining for her.

Now this is the part that I know sounds quite selfish. I don't feel like my needs are met out of this friendship. I want someone that I can cuddle, do stuff with, and learn from. My mental health feels worse off with maintaining this friendship.

I have given her money without her ever asking. I gave her my old PS2 so she could relive the positive part of her childhood. She has always been appreciative of these things, though I understand that none of these things are guaranteed to make her feel better, short or long term.

I also talk with her best friend L (20F), who mostly just makes sure that I don't hurt K. (For context, K and I live close by, L is in another country). She also has a strong distrust in men and was extremely jealous of me when K and I dated. It feels toxic having L around, so that's another reason why I want to call off this friendship.

The way I see it, I have two choices: either I stick around for K and hope she gets better, or I put my own health first and find more positive friends to be with. Am I wrong for rather doing the latter?