<human>: Give me the gist of the text in a nutshell

My issue is quite simple and I'm stumped for what I should do to improve my own mood. Essentially, I've met a girl who I really like and we've hung out and talked a lot, in a way which I've experienced as dates. However, despite all of this, she has made it very clear that she already has a boyfriend and isn't interested in the same way as I am in her.

She is in an LDR (long distance relationship) and as of recently for the holidays, she took a flight to see her significant other, who I don't know much of anything about who it is. I cannot help but feel jealous about it all & think about what she is doing at this very moment or how great of a time she must be having. I just cannot help stop feeling jealous and I don't know what I can do to stop it or to make myself feel better.

Ultimately, it's getting to the point where I'm growing depressed from it all. It's hard to get up in the mornings and my bad habit of stalking social network profiles is growing into some sort of mental self-harm. Me and her friendship is very important to me and I don't want to give up on her. Whenever we hang out I get hugs; and hugs are very important to me & my generally down mood. What can I do to fight my own jealousy so I can feel better and await her homecoming?
<bot>: I'm jealous over my crush's boyfriend, who I don't personally know. I cannot leave my crush because our friendship is important to me. What should I do to feel better?