I Messed up really bad.. too late but i dont want to lose

i dont know what to say and what not..
there has been jealousy and break up
i messed it by being the grumpy one
i had my problems i solved it
she gets the best of me
now she is happy in real
she likes a guy and that guy likes her
its a really long distance relationship btw us
but not for them, its a recent thing btw them
ive went away from her time to time so i wont be mad, upset or fight with her
ive even tried to move on, tried to do lots of work before this guy came in equation,
so i can focus on better things and be happy
but the more and more i kept leaving
the more she stopped loving me which made me upset n mad
i gave paras of explaining my reason and how much i love in calmest way still..
thing is im willing to do hell lotta stuff for her
i might even take a bullet that silly and deep in love im in with her
we might not even end up in real yet im ready to take every possibility available, ready to wait too
its just stupid i know, thats how much i love her and even how much i try i cant even think of any other girl as well
but then later with her its like she doesnt want me anymore and she aint the same, wont even care much
maybe its my fault, i guess it is but then
what shall i do? if i leave i still think about her every moment even in my work
please help and give a sollution, thanks

Well, you told me a lot and still very little...

But here's something great to focus on: "She likes a guy, and the guy likes her back. She's happy."

^ That, right there, is the ending to your tale, I believe. This is because true love, in its basic form, is always wanting to give and never take without giving at least as much. It's wanting to see the other person happy no matter what and wanting what's best for them.. So, in short, if you love her, you'll let her go. You'll recognize her happiness without you and respect it. Because if you try anything to win her back, you'll first be showing that you don't really love her. And second, you'll be disrespecting her happiness and treating her like an object.

Let her go. If she loves you too, she'll come back. If not, the love of your life is still out there and has yet to be found.

thank you for such a great advice, its really a hard phase for me to cope up with
she just likes him and she is only talking about him now that how much she is struggling to talk to him
where as when it comes to my case she wont even care to ask how i am..
her answer to it is that she doesnt know what to talk about?
what shall i make of this?
and what shall i do now then? because letting her walk away feels like im closing the minute possibility to even be with her
which apparently i should do but as i said, if i do that she gets best of me and i cant focus on anything