I read somewhere that if a guy really like you more than a friend, he will do something about it wheather he will ruin the friendship in the end or not... but this depends on what kind of guy he is I guess since everyone is different.
He either was really drunk when he told you that he likes you....
You like him, this is really upto you, but if you really like him then I really think that you should just text him and ask him out to lunch or something and then talk to him about your feelings for him and see what happens.
If he is ignoring that text then he might not ever respond or who knows... he could just be really busy...I don't know, but if you want an answer from him then you should just ask him in person to get a straight answer even though you might not get the answer that you want to hear from him, but if you want to clear things up then you should just ask him in person or you could wait another week... or wait until he text you.
If this happened to me, I would go a bit anxious and won't able to sleep until I get the answer so I would do something about it...