I've consulted pretty much everything I can find to read on other websites, so I wanted to bounce this off of you guys

I've been seeing this girl for about six months. We spend a lot of time together, know each other very intimately, the whole nine yards. But she won't commit. She claims to "not be ready" for a relationship, but for all intents and purposes we are anyway. She talks about respecting boundaries all the time, but still sleeps at my place multiple nights a week. I'm also not respecting "boundaries" if I ask her where she is or what she is doing if she is out and about without me, but she sees fit to question me all the time when the shoe is on the other foot. She also exhibits extreme jealousy and possessiveness whenever I interact with other women, whether in person or online. I care about her a lot, but I'm getting tired of the double standard. What do I do?