This is a very helpful article that really gives great insight as to whether you are headed for an exclusive relationship or not;
"It’s a well known fact that if things are all moving along nicely and you are comfortable with each other, you both should know if you want to be exclusive without having to say it. But what if you are ready to move into exclusivity and he doesn't make a move or she doesn't seem to be thinking about it even after you’ve dated for at least 6 months how do you find out if he/she is willing to give up all others and date you exclusively.
Going about it the wrong way, like nagging and begging, will likely make him/her run for the door, so what is the right way to approach the situation?
1. Take note of how much “quality" time the two of you spend together.
If your dates consist primarily of dinner and a movie, watching late-night TV, cuddling and then having sex but after the night of so-called passion, he/she disappears and forgets to call you for several days, that’s not dating, that’s a booty call. Let's face it – it’s obvious he/she just wants sex, nothing more. And why buy the cow (and all the maintenance costs) if you can get the milk for free...."
- http://searchwarp.com/swa149997.htm
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Source: SearchWarp.com, by Yangki Christine Akiteng