raza86, when did this incident happened?
5 yrs relationship, i believed that your relationship is stable and both of you are known to each other.
women is difficult to understand, try not using men's logic to think from her angle. you should think from her angle using women's thinking.
before doing any thing, just answer these questions. are you still love her? do you put her as your only candidate in your marriage? if no, then you can walk out from her without further thought. then, why you still suffering in thinking the way to understand the situation.
if yes, then continue.
then you need to look out some ways in rescue your relationship.
how to give her confident back? by promising is not enough. you need to act it out... to show you are sincere in having relationship with her.
by guessing what she thinking about is totally prohibited. this is because you are never know what she is thinking about...
then, how can you know what she thinking about? the answer will be very simple >> ask her directly.
the only channel to know the reason is from her mouth. remember that human is complex, communication is a very very important tools to understand each other and to build a healthy relationship.
Meet her up, text her are the way in communication... i personally prefer talking face to face... this is because both of you can look for each other and notice your emotion, facial expression [body language]
sitting down there and think about it is not effective, take up the phone and call her up. to DISCUSS this issue calmly and openly to her...
TAKE ACTION always the better choice than sitting there and think [do nothing]