How am I supposed to know if he's single or not?

[Desiree]

So this guy at my school, I have a crush on him.
I found him on Facebook, and only followed his page. He sent me a friend request and I accepted. I'm scared to make the first move, so I'm waiting for him to get online and message me or something.. :/ on his profile it says single.
But I was going through his pictures of him and his "girlfriend." And on her profile, her profile picture is a picture of them two together, and that was updated December of 2013, like one month ago.

He knows I like him, he even wanted me to write a letter to be sure that I liked him, because I never went up to him and told him. i always asked my friend to. So.. how can I find out, or should I just simply wait :/

[Jane]

"do u have a girlfriend?" thats it

[Kody]

Just ask, don't be afraid

[Matthew]

Ask him! You sit around waiting and you could be missing alot of good in life. Take the bull by the horns and handle that!

[Blue SKY]

The best way to go about this is to get to know him a bit and then ask him. But if your to shy to do that in person then try to add him on FB and ask him that way.

[John W]

It sounds to me like he has a girlfriend. Just ask him and see what he says. Then you can ask his girlfriend and see what she says. I have a feeling he doesn't want his girlfriend to know about you if you know what I mean.

[aviva]

There's nothing wrong with asking him, though I am a bit concerned that he wanted you to write a letter for him. Not really knowing him or the reason for it, it just sounds a bit suspicious to me :/