Expectations are a lot like beliefs, but involve others as well as ourselfs.  We have expectations of ourselves that may actually differ in some ways from our core beliefs.   We may believe that we should always be kind and understanding to others, for example, but don't really expect ourselves to live up to that ideal so we don't live up to our core belief because of the expectation.
    This is even more true in how we deal with others.  We have expectations, both good and bad, of people we know.  Because of those expectations, those people will usually behave the way we expect them to, not necessarily because it is truly their nature, but also because they are guided by the vibes we send out with our expectations.  
    Expectations are not a bad thing.  Life would be impossible if we couldn't form opinions about people to help us decide who we wanted to be around and who we should avoid.  Who we can trust to know our secrets.  Who we can ask for help, financially or otherwise, when we need it.  On the other hand, expectations that we form from just one or two encounters with a person, or, worse yet, from what we have heard from others about the person.  For example, you might tell a friend that you find some guy attractive and your friend warns you that the guy has a reputation as a love-them-and-leave-them type who goes through several girlfriends a year.  As a result, when the guy comes over to talk to you, you send out vibrations that tell him you aren't interested so he gives up.  They you find out your friends opinion was somewhat exaggerated because she is one of his former girlfriends.
    Even pets are affected by expectations.  Have you ever noticed that usually nice, friendly people have nice, friendly pets?  It's not coincidence and it's not because they have carefully selected those pets.  It's because of what they expect from themselves and from their pets.  On the negative side, if you think your dog is dumb and don't expect him to learn, then he won't, even though he may actually be a very smart dog. 
    So try to avoid letting your expectation limit yourself, your friends and your pets.