I want my bf all the time!!! do you feel the same?

I don't understand if it is normal!!! I feel I want him all of the time! When we meet, when we eat, when we are in the cinema or street, at home, on the phone, messaging and even not talking! What is happening to me??!! We've been together for almost 4 years! He is my first man. At the beginning I wanted him too, but the feeling only grows. So, it is more and more. Now almost every second. I work... but even at work I think of having sex with him😭😭😭😭😭 How do you guys cope with it?