<human>: Could you distill the essence of the text into 1-3 sentences?

We have only been dating a few months, so let me start with that since it is still in the new stages. But she has this friend Dylan that she talks too all the time, he is from the town we both moved from and I'm not sure how they met. But she says they have been extremely close for awhile, and she was considerate enough to mention this guy very early into our relationship and asked me if it was okay. I trust her that she isn't looking to cheat on me with the guy or anything but it still makes me uncomfortable which I let her know, I told her basically as long as it is nothing physical and isn't something you would only say to people your in a relationship with then it is fine.

Now, she talks to him way more than me and discusses every detail of our relationship with him which also makes me uncomfortable and I know there isn't anything I can do to stop that. They are constantly texting each other, while it takes her ages to respond to me most of the time and they text each other things like how much they miss each other (Something I saw a couple of times on accident). I confronted her the other day about it and she told me they have tried to get physical before but it just wasn't physical for her. But it's clear to me even though the guy has a girlfriend he is both physically and very so emotionally into her. 

My question to you guys basically is, how do I avoid being jealous of this guy. Or is their something I should tell or ask her.
<bot>: SO is extremely close to a guy and it seems borderline relationship level and it makes me uncomfortable, how do I deal with the jealousy?