Do you think this the right thing to let her go or not? please help, thanks?

i'd say let her go sounds like she doesn't want it to go anywhere and for you its just too hard as you were at her b.d. hoping no other guy was kissing her ect. i'd say she is giving you mixed signals and that isn't right sounds like she is free enough to date so if so why aren't you? almost like leading you on and that sounds like a tease to me. so think more of yourself and be done and find someone who likes you and move on.