Why would a girl not let you become strangers?

We have a history. Never gone all the way. Just kissed a few times. She had severe mental issues so I took a step back.

She always pops up now and again and I've noticed our conversations are becoming more frequent. I was thinking that she had so many chances to just move on and forget about me and she insists on sticking around in my life. Thoughts?

FYI, she is a nice person and I do care for her but I haven't even attempted making conversation with her since November last year. Whatever communication has happened has been 100% because of her.

Why would a girl not let you become strangers?
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