<human>: Background: me 22/f him 23/m, met on OKC in June, but started dating in the beginning of October.This is my first "relationship" as well. 

About 6 weeks into seeing him about two or 3 times a week, I bluntly asked him exactly how he sees our relationship. He sort of puttered around the answer, and I just told him that I'm fine with what you decide on, I just need to know for my own sake. He said he wasn't interested in being in a serious relationship, but he didn't want to stop seeing me. I was okay with this, and eventually we talked it out to make the decision that we were going to be exclusive but that this was just casual. We were already having sex at this point, so it was sort of a relief to hear the exclusivity since I don't want to be slept around on. 

After that, we continued to see each other, and more and more frequently. I'm currently spending the night at his place almost every other night when possible ( we both work late nights). I really enjoy being with him, and realized this even more so when he went on vacation for a week recently, and didn't have much contact with him since he was on a cruise. 

Physically, he's always touching me in subtle ways, or playing with my hair, or just holding my hand. When I spend the night, it's not always for sex, but just to be with each other. He takes me to events with his friends, and I do that as well when mine are in town. 

I honestly didn't expect to feel anything romantically for him, and just wanted to enjoy his company/regular sex in the beginning. But now I'm  I'm feeling more for him than I should feel I something casual, and am wondering when is the right amount of time to ask about the two of us. I need to know if this is just casual for him. If it is, should I break up with him knowing that it will be better now than if I actually fell in love with him down the road? I don't want to get caught off guard, but how proactive about this should I be? Is 3 months too short, too long to be thinking about this?

Summarize the given text in a few sentences.
<bot>: It's been 3 months of me getting closer to him, and I hate the term casual-but-exclusive.  Should I bring this up with him ASAP or wait until more time has passed?