This isn't a gender issue per se.
Unfortunately a lot of people "cool off" after the "infatuation phase" of a new relationship. In fact many folks believe this is "normal".
Either way it's after you have gone through the "infatuation phase" of relationship that you reveal your "authentic selves".
It's almost a cliché to hear someone say:
"She/he is not the same person I fell in love with."
The goal for most people is to find someone who will (naturally) love them (the way they want to be loved). When our mate doesn't say/do the things (we) believe are an indication of love we (feel) unloved.
The mistake a lot of folks make is investing time and emotion trying to get someone to "change" into the kind of person they want instead of looking for someone who (already is) the type of person they want.
People don't "change" unless (they) are unhappy.
There are only two ways to experience joy and peace of mind in relationships: We either get what we want or we learn to be happy with what we have. Accept them (as is) or move on.
"Never love anyone who treats you like you're ordinary."
- Oscar Wilde
If someone ignores your calls and texts they clearly don't believe you're all that "special". She's not "into you".