How soon is too soon?

So I met this guy in February and we would talk on occasion.Then around April we started talking a little more frequently and decided to make it official Around the beginning of May he told me he thinks he's falling in love with me. Ok....isn't that kinda fast. Now it's like he has to call me everyday. Is he crazy or am I just not affectionate enough? I care but his constant calling is giving me a headache!