Do not fear, for I, am here. Better of -blam!-ing paused with those comas when you were reading, if not you already messed it up, go back to start. Now son, listen close, 3 years is a very long time to be friends with someone, you both have probably already made a bond. You might have a good chance of her returning your feelings, but you have to think, is it worth it? LDRs don't usually end well, I'm not saying all don't have a happy ending but I'm being realistic. Also, if you never ask you'll never know and it'll haunt you but if she does return your feelings what is the good of knowing you could have her if you'll be haunted forever that fate kept yall far apart. This brings it down to a personal decision I'm sorry to say. If you want what I would do, good, because I am going to tell you. I would tell her, I can get over the pain of not being with her eventually and if a chance ever shows up where yall can be together then you won't have to second guess because you'll know she likes you. TL:DR Do it, either way you might go through pain but telling her leaves options for a better day.