Right - assuming you've got a good, properly centered gut, it knows way more than your heart, and certainly more than your head (which is just making things up anyway), and then of course there's that other part that it just totally mindless...
If you aren't comfortable giving each other the space, understanding, and respect that you need now, it's going to be a nightmare down the road. Many people are ready to stereotype men as not being willing to commit, but from the situation you describe, it sounds like the problem is more of someone who is desperate to do so (or perhaps just desperate to get out of another situation, with a good excuse).
My rule of thumb for a while now is that I would have to be pretty seriously involved with someone for a good year or so, before getting really seriously involved - you have to go through some ups and downs, and a lot of different experiences, to really get to know someone.
Sounds like you already know the answer, but it's good that you felt you could find some support here. Perhaps someday you'll let us in on your true identity, but in the meantime I'm not even going to try to guess :-)
-Bob