How to trust someone you love?

After being lied to by my girlfriend i lost a lot of trust she was regainin the trust and did somthin stupid again and lost it all ots happened 3 times ( don't think she cheated but unsure) i was that paranoid that she was up 2 no good i put my apple id on her fone and used find my iphone to track her location 2 see if she was tellin the truth she wasent anyway she found out what i did went mental at me now i'm no longer able to tell of she is where she says she is and yes i know its bad to even have to do that and i don't want to do that i want to trust her but feel as though i can't

I have even got 2 the point where i will go meet her from work and wait a good couple of hours before she has finished outside like some creepy stalker

But the reason i do that is because once she lied to me sayin she was at work and she wasent (tracked her iphone)

Anyway what advice can you offer

If you don't trust her, don't be with her.
If she lies to you over small things, she'll more than likely lie over big things.
If she loves you, she wouldn't be doin this.

Never try to control, possess or own anyone, you will always fail. Trust her until she actually does something to break it, then dump or forgive her.

You don't trust her so why be with her? Do you really wanna live your life like this forever?

You can't love someone you don't trust

Trust is the most important thing in a relationship. Sometimes, when it is lost (especially several times, in your case) it just can't be gotten back. Sorry to say, but it may be time to move on.