well if you feel ready for the "deed" (hehe) and you are positive she is, then i suggest you go 4 it! The phone calls sound interesting aswell as the txts. And the hot tub thing just sounds like a real invitation
I am confused about the feelin ready part. If its 2 break up then think about it carefully. If it is about losing "it" then also think about is hard. Remember that you will remember this girl for the rest of your life.