What does this mean and what do I do?

Recently my girlfriend has just been getting really quiet. I ask her what's wrong and she either doesn't answer or she says nothing. And anytime we're not together and I text her about anything besides coming over she just ignores me... Does this mean something bad? I don't know if I did something wrong, she won't tell me, and I don't know what to do to make things better
What does this mean and what do I do?
Post Opinion