What's an acceptable way to express the general sentiment of "I love you" when it's too early in the relationship for the l word to be acceptable? Specifically in the context of
*girlfriend does/says something geeky/adorable*
"...I love you so much"

A friend suggested "You're amazing" for more general usage, but in that context the best I can come up with is "<3", which kinda works in text but isn't exactly pronouncable.

English doesn't have enough words.