Do you think it's wrong if I start lying to my girlfriend?
Why would you want to start lying to your girlfriend?
I don't see a reason to be truthful with her. She lied to me before and I'm tired of that.
You shouldn't be in a relationship if you both are going to lie to each other. A relationship be built on trust not lies.
We don't have much of a relationship at this point. Dealing with her lies is tiring and not fair to me.
If you're really unhappy with the lies she's telling to you then maybe it's time for you to end the relationship and move on. You'll never be happy and it's not fair for either one of you to stay in a relationship that's not working.