A: Well, it really depends on both of you. If you love him then pursue it then. if you are not sure.. well, that's a problem. my advice is. analyse the situation and don't make a big mistake.Don't think once but think twice.
A: I think its the obsession on the feeling that you once had for that guy that makes you wonder if you're still like him. well maybe in fact, it's been long gone. Try to test yourself if you still really like him or else it will ruin your present relationship.
A: Well.. to get your girlfriend to open up to you more is to understand her more and be sensitive to her. that way.. you will make an easy topic to talk about.
A: First you have to make an easy conversation like.. "how was your day?" or something like that. then open up a topic that he most interest in. if the conversation is leading to an argument, you have to pause and change the topic with ease. that way, it will least the awkward situation.