Well I've been with this boy for 11 months now. We would have made 12 this month, but all he do is lie, lie, lie and I'm fed up with it.

He tells me all kind of lies, but somehow I peep everything. I now know how he really fills he inboxes of girls on FB, and be like what's good? Do they want to be his girlfriend?

I've played a prank on him and found out the truth but now were not talking but I can't stop loving him so what should I do?

You keep the liar out of your life and give your heart time to heal from this whole thing. That's what you do, and realize it will take a lot of time and work on your part to get over the mistake of giving your heart to a lying fool who doesn't deserve your love, or know what to do with it.

I totally agree with talaniman. Why would you stay with a liar?

Also if you are to the point that you need to play pranks on him then what does that tell you about the state/health of your relationship? Let him move on to lying to the next girl.

As the poster above me said, it is wise to keep liars out from your life. Having a boyfriend/girlfriend means you sharing your happiness with them, I wouldn't recommend sharing happiness to a liars so forget about him and move on, you deserve a better person.