I (22F) have this friend (21F) for a year and a half now.

I tend to be the old sister of my friends that i take care of everyone around me as it gives me validation somehow since i actually am one.

so whenever i'm with her, i always make the orders, cross her the road, making her walking in the safe side of the street, etc

she started seeing me as her mother and trusting me with her problems which are A LOT.

I never complained actually because i really like listening to her venting and i'm trying to find solutions but she won't listen when i tell her to go to see a professional therapist because i started getting exhausted by being her mother and therapist "never told her that and never will, she's sensitive".

After a year, i started acting differently. Not chatting with her much. "I don't talk with anyone that much but she's the main character here so...".

I'm a person who HATES phone calls and she knows that which is a good excuse for me to not listen to her sometimes, but i over done it.

She always tells me to take my time and we can talk whenever i'm comfortable but a few days ago she sent me a message that she's really upset by the way i handled our friendship without even checking on each other.

I panicked when i felt i might lose the validation of being an important person in her life and to lose her as a friend since she's really caring and we have so much in common.

Somehow we fixed things and i start chatting with here more often, but now she'd feel whenever i'm not fine with talking and keep asking me if i'm okay which is a burden for me. I guess i'm not comfortable when it's the other way around and other people take care of me.

So what should i tell her to stop worrying about me, to make sure I won't ruin our friendship, and finally to not get overwhelmed whenever she vent.

P.S. It's just whenever we chat or call over phones. this never happens when we're actually together in the same place since she always tells me how i calm down her anxiety and make her feel better by being by her side and reassuring her.