My guy friend is acting strange. Any advice in what to do?

I have been friends with Mike since 7th grade and we just finished 11th grade a week ago. We have been close friends, texting, talking, snap chatting etc. of course, I don't have Facebook or twitter, so we don't communicate through those means.

There is this other girl named Taylor that has a crush on him and asked him to go to Jr. Prom with her. However, Mike said no that he had a date, though he didn't. The next day, he asked me and I said yes. So, we went as friends but Taylor found out that he had lied to her. I had no idea that that happened to begin with until after the prom.

Since then, Mike and Taylor gave gone out together and such, which is obviously fine. They also went out together before the Jr. Prom too. He always tells me how annoying she is. Mike and I weren't dating or anything and I don't have a crush on him. But, ever since the Jr. Prom, he has been acting strangely to me. It's weird because he acts normal to everyone except me. He barely texts me and I know that he has flat out lied to me about being busy when I invited him and others to the beach with me.

Mind you, I don't particularly like Taylor, and I know that she doesn't like me. But, she isn't dating Mike. I know that for sure.

I'm not one to confront people, but I'm not sure what I should do. Should I ask him what's wrong? Any advice is appreciated.