I met this girl like 8 years ago in my tennis class, fast forward to now after talking on and off over those 8 years, nothing really memorable or interesting, we started dating recently, we've been on 3 dates and all of a sudden morning she texts:

Love You Baby

Dafuq do I say to that? I've though about:
- Did you mean to send that to me?
- That seems a bit sudden.
- Woah, moving a little quickly there!
- Thanks.

And yes, option 3 is to just let it be and not say anything. The last thing she texted me was a couple days ago, pretty much saying "let me know when you want to hang out next".