Ignore her calls/texts always worked to me.
Added bonus of her hating you coz you not an "man" you will never here from her again
Personally never like to burn any bridges. You never know down the road
Meet with her and let her know you're no longer interested in her
Don't be a p*ssy.
just tell her it's not gonna work out, if she cries and stuff...deal with it.
I would still be your boyfriend, but the way my heart is set up...