<human>: My friend and I have been friends for many years now. We met at a college party and became fast friends. She was in a relationship at the time and after 5 years with the guy, she broke it off before Thanksgiving. She and I live across the country from each other now, but have kept in contact constantly.

She has other friends obviously, other guy friends for sure since she's attractive. Sometimes I text her and she's out with one of them having lunch or just hanging out. I've tried to remain calm about it, but there is one guy who has been standing out from the rest recently. He's been mentioned more than often ever since she's been single. 

My questions is, how do I handle my anxiety over this so that I don't do something stupid and ruin things with her?

A few tidbits

She is always responsive to my messages. Not much time will pass after I send one before she replies. She is is always cheery when she responds too. Though rationally I suspect that's with everyone.

She always calls me to talk when she is depressed. Sometimes she will send long messages about her day as a teacher before she will ask if we can talk on the phone

She likes to snapchat me a lot. Though rationally, again, I can't assume I'm special somehow from that fact. She might be mass tagging people.

Recently though, this guy has begun to slowly appear more in messages she sends. Either she's out with him, he's over with friends at her place, or that she's going to events with him. She's already said that he's a friend she met at a school event she had to be a volunteer for. She never mentions how she feels about him, but unlike other guys she sometimes hangs out with, she hardly replies back when she's with him. She'll reply when I assume there is a lull where she may deem it's not disrespectful. Other guys she's been around, she'll text back almost right away.

Condense the text into a few key points
<bot>: I'm falling for my friend and I need advice on how to cool my anxiety and a guideline on how to approach this situation.