Four Months Dating. No "title"?

Hello! So this guy and I met online and we've been seeing each other every weekend for 4 months, exclusive since we met (there was never a questions from me. He told me he was only seeing me).

I've met a couple of his friends, he's met mine and some of my family. We have (amazing) sex. We keep in contact during the week and basically just like being around each other. Sometimes we'll have all-day-in-bed-and-do-nothing-but-watch-bad-tv days, other time we'll go out and have a drink or dinner or whatever.

He's only ever introduced me as his "friend" or his "date." I'm wondering, is there some kind of sign or event or something where we go from just casual dating to boyfriend/girlfriend status?

He's really romantic with me, he shows he cares a lot (remembers little things, always cares for me, makes sure I'm comfortable and feeling good). We have the same kind of humor and have a lot of things in common in terms of life philosophies and whatnot. We just generally like having light, fun times. I'm really into him and I can definitely see myself falling in love with him. What do you guys think? Will he ask me to be his girlfriend or is it just that we ARE and it's just so new that he doesn't want to put a label on it (we chicks are so obsessed with labels, it's disgusting. LOL)
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We've been boyfriend/girlfriend for about 2 months now. :)
Four Months Dating. No "title"?
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