Im a guy in a relationship but i think my GF is no longer interested in me at all

I havent cheater or did anything to actually hurt her as far as 3rd party issues would go
But i found out she is still inlove with her EX or it seems that way, she's become very secretive about her cellphone and she even has a 2nd Facebook account and they friends sa iyang EX there, when i caught them we talked it out and said we will try to work things out, but why is it that it seems that im the only on doing all the effort to actually keep the relationship ?

It's going to be very hard for me to let this lady go ,

but i do love her
Any advice ladies ?