How do i show my boyfriend i realy like him?

i was dating my boyfriend for about 3 weeks when we both decided to get together properly, it has now been about a month and im really starting to like him, i feel insecure sometimes that he doesnt want to be with me, but i think sometimes he feels the same, how do i show him that i love being around him and that im really starting to like him without saying i love you ?...