Any advice on crushing on my best friend's girlfriend?

Ok, so I've got two best friends (one guy, one girl) that have been dating for a while. I had a really big crush on the girl before i knew the two had already got together. I told her how i felt and got rejected, then not too long after the guy, who knew i had a crush on her, told me they were goin out. That was crushing and uplifting at the same time cause i knew they had both found someone that was perfect for them. Now with that several months behind us we are all still the very best of friends. the problem is that after talking the her, literally, everyday for so long I'm starting to have feelings for her again and I'm not sure what to do about it. I'm not gonna stop talkin to her, but i can't tell her how i feel, again, cause now the two are quite serious in their relationship and i don't want things to become weird between them and me. But the more i talk to her, the stronger the feelings get stronger and they are eating me up inside. i feel like I'm just gonna blurt it out one day soon without some advise to help, so anyone got any? I'd really appreciate it. and try not to tell me to "Just get over it" cause I've already tried that and it ain't happenin.