Search Results: guilty over break up

We've known each other for over 2 years, and we're really good friends. This past 6 months/year we've gotten increasingly close. We trust each other, confide in each other (though more me than him I will admit), and he just all around has my back. He is an amazing friend and does a lot for me. He's open and honest, and in the past few months, the touch barrier's been broken. Touching my shoulder when he greets me, brief hugs, etc. However, I'm 17. He's 22. IF he likes me, I think he's waiting for me to turn 18, which is understandable. It would also explain why he is only open/affectionate/whatever else when other people aren't around. He definitely changes and becomes more relaxed when it's just us. And texting/meeting up is 2-sided. However, I'm afraid there might be another girl; I can't see into his college life, after all. I was talking to one of his female friends that figured out I like him (I don't conceal well). I asked her if our age gap was too much, and she said "No, that's not your problem." And cuz I'm dumb, I didn't think to ask WHAT is my problem. But the tone did possibly hint at another girl. I can be paranoid, though. But there was a girl he openly flirted with on Facebook (yeah, I fb stalk... Guilty as charged). He's a forestry major, and he works in a sawmill. There was a picture of him trying (and failing) to look tough by a huge log he cut.

Her: Lookin' sharp :)
Him: Thanks (her name). You know it has been said that lumbermen make the best studs ;)
Her: Haha I don't doubt it (his name)

Sooooooo. Am I making a big deal out of nothing, or is that bad? Considering I'm 80% sure he knows I like him, and he does nothing to deter me, but rather encourages me, I really think there might be something. He would not lead somebody on that he doesn't like back. But... I'm a little worried. Should I be?