It really boils down to what you wanted to do. If you wanted to sleep with him (safe sex) there's nothing wrong with that, EXCEPT that you do know you have a tendency to get a little too "involved" a little too soon, and if sleeping with someone is going to make you feel like either of you owes the other something as a result of said sex, then maybe it's best to wait until you feel like you're ready to take that chance.
It does sound like he was somewhat pushy about it, and you seem to have difficulty saying no because you worry about hurting someone's feelings or making him disappointed or uncomfortable.
As long as you are willing to look at this as another effing learning experience
, no harm, no foul. Let it go and give some thought next time about what you REALLY want, and resolve to go home if your wishes aren't respected.
Oh, and I agree with what SparkleKitty said--not everything that happens to us is a "sign."