<human>: So I've been with my girlfriend for 16 months now.  At the beginning we we're just kind of having fun (we're young, just finished our 2nd year of university), and that's all it really was.  I mean we cared about each other, we liked each other, she's an absolutely amazing girl but I couldn't see myself being with her forever kind of thing, which was kind of clear between us.  We were young and were enjoying our lives.

But in the last 5-6 months, things changed, we became much more closer, We started sharing things that we never told anyone in our lives ever before.  While I'm not planning on getting married anytime soon, I could see myself going the long haul with this girl.

Can you condense the text into three sentences or less?
<bot>: I was just wondering how long into a relationship it generally takes for things to become serious/intimate (not talking about sex) etc.  I'd imagine it would be different for different age groups but still interested.