I think she might really like you, especially if she called you a gentleman. It may not seem like a big deal to men, but girls really appreciate manners and kindness. If she made the effort to send you a sms right after your date, then that's definitely a good sign.
How long have you guys known each other, or how many times have you guys been out together? A confession might be too soon (mind you, I don't know how long you guys have been "together" so the timing might be appropriate).
All in all, I think she really does like you, and it seems like you really like her!
