3 Months Is A Bit Too Soon

Let's see... yeah, I think 3 months is a bit too soon, for a couple reasons. First of all, you don't wanna scare him. Are you sure he's ready for such a big step? He may casually talk about the future, but that doesn't mean he's prepared to get down on one knee so soon.

It's painful to breakup after an engagment.

Second of all, it takes more than 3 months to really know a person. I'm not saying you're wrong to have these feelings for him. That's a good sign, actually... but if the two of you make serious plans to spend your lives together, then find out you're not as compatible as you originally thought, it'll be all the more painful if the relationship ends. I learned that the hard way (not fun!).

It's great that you enjoy his company this far into your relationship, but I think the safe thing is to take some more time and see how you both feel in another couple of months. Better safe than sorry, no? Then again, look at Dharma and Greg. ;-)