Help with relationship.

So I'm here in regards to help with a woman. I'll give you the full backstory on my situation here. There's this girl I dated in high school for about a year. We broke up, then proceeded to date again for a couple months before circumstances out of our control forced us to break up again. This time frame was from 2012-2013. We were distant for a couple years, and then in about 2016 when I enlisted in the Marine Corps we started talking on and off again, as friends. For the past 2 years however, we've talked basically every day, excluding the times I wasn't able to when I was deployed. I've dated other women since then obviously, and nothing has worked out, either because the aforementioned girl (we'll call her Jessica.) became available so I made myself available. She is a very big influence in my life, and the first thing i think about when I wake up, last thing I think about before I go to sleep. When I was deployed, she got engaged to someone, and it crushed me, and I kind of went dark on her, because I couldn't bring myself to tell her how I felt and I wanted her to be happy. After a few months of not talking she messaged me and asked why I was distant, so I explained. She had said she told me she was engaged in case I had any reservations about it, which I didn't realize. I'm very, very naive when it comes to signals from women, like bad. The engagement fell through however, and I didn't want to immediately be like, "Hey, give me a chance." because I value our friendship and just having her in my life, even if I want more. However I told her whenever she's ready to date again, I want to be the first to know, and she agreed. Lately though, she's been doing things that I read as, almost flirtatious, maybe. I'm not sure like I said I'm not good at reading signals from women, and maybe I'm just wishfully thinking or overthinking. Things like changing my Hulu account name to Dummy, talking all day everyday and only to each other for months now, calling me when she's drunk, just the overall way she talks to me. I guess my overall question is should I risk our friendship and current relationship to take a chance to be with her again, or am I seeing something that's not there, and should I just keep on keeping on? Keep in mind also we literally live on opposite coasts, so that's also something I consider when thinking about being with her. Any help is much appreciated because I'm kind of losing my mind about this and I just want it to be resolved, I'd like some clarity. Thank you.