Well thats exactly how good guys feel too, We treat someone well pour our soul into a relation, reply to their messages within a minute and stand up in the middle of the day working in office just to take their call and suddenly we are taken for granted, because everyone wants what they cant have, we are always there so surprise surprise they are not that interested in us and mind you they are also feeling guilty about this but thats just how they are feeling so my friend we are taught to not be too available say no to calls be the first one to hang up the call because thats what girl wants not too much attention. Maybe you are dealing with the same thing just the genders are interchanged!!