Mag's advice above is right on target. And major kudos to you for slowing things down! That was totally the right instinct to keep it all from blowing up in your faces. Definitely read some if the stuff on the xeromag site that Mag linked, it's the best resource that I've seen out there. Encourage them to read it too. Keep it going nice and slow, build the friendship and DEFINITELY practice safe sex for the time being. Try to keep your life balanced and don't neglect your sort-of-ex during this crazy time if you think you might really want to build something with him.
Best of luck!!