Need relationship advice

I have been dating this guy for about 2.5 months. This is my first real relationship, he's had a few (I am 27 he is 30). We met on matchcom. If I had to write down the traits I want in a man, he fits them. I am very independent and never had to worry about other people and would do my own thing. He wants to hang out all the time but we talked about it and he understands that I need my me time and is very patient. We always have a lot of fun when we are together. One night, about a month in, we stayed up talking until 5am. It was perfect. I just knew right then that he is the one. Well, all of a sudden, out of nowhere I am having different feelings. I can't even explain how I feel..I just feel nothing. When I used to be so excited to see him after two days apart, last night when I saw him, I felt nothing. Not good not bad just....nothing. I mean he does a few things that annoys me, just little things and I'm sure there are things that I do that annoy him too but I don't know. I'm so confused as to why all of a sudden I'm having these feelings. I know he cares about me so much. Is this normal? Like I said this is my first real relationship and I don't know what to do.