How do I deal with feelings of sadness and such from this?

Okay, so I didn't really know the best way to word the question and keep it on the short side. You see, there is this girl I really like. We talk daily. Recently we didn't talk for a few days (she warned me about this, lot of stress for her the past few days), she likes me too, we dated for a bit once, and the feelings still haven't gone away. We just recently started talking again, and I found out from a mutual friend that she started talking to her first before me, and I didn't like it. This mutual friend is someone we both open up to on occasion, so i feel like she only messaged me cause she was pushed to. I know it sounds selfish, that I want her to message me first. But what do I do? How do I become more okay with it?