Unless there's something extraordinarily "grown up" about this guy, don't assume he's ready for a serious relationship. I was the guy in such a situation, and looking back a few decades and a couple of divorces, I was not ready. Have fun, but don't be too hopeful. Also, remember that the 30's is for a female what the late teens is for a male, so don't let your desire override your good sense.

How to stop the madness? If you can do this safely, try to get an intimate, no-notice look at how he lives. If he lives like a teenage boy, well...that will be one warning sign you need to see early on.