Why is my boyfriend doing this please help

I ahve a boyfriend and we been going out for a while he calls me and talks to me but the last time I seen him was last week on a monday I did not see him the rest of the week and yesterday he called me and told me he was coming over then today he calls me and tells me he was going some where with his friend and he might come over later do you think he is up to something or cheating on me he calls me tell me that he loves me he so nice but what is he doing

I think he is just not matured enough for a real g/f-b/f relationship, or he is loosing his interest in this affair.