Everyone has lied about having a significant other at one point or another. Wait, just me? You all don't do that? When you have a significant other, it tells people that you're desirable. No wonder people will go to great lengths to lie about it, especially when it's so easy to fake with the internet. All you have to do is post a fake photo like this guy did and all of a sudden people will believe that you're a stud... NOT! Nobody is thinking that.
If you're going to lie about having a girlfriend then you better make sure that your lies are air tight. That means making sure that your imaginary girlfriend shouldn't be in the reflection. This is the type of thing that you'll never be able to live down. Always check your frame, people.