Question about The Time Traveler's Wife (book)?

I'm currently reading The Time Traveler's Wife and have just finished reading the part when it's the night of Ruth's birthday and Clare and Henry have just driven home and parted ways. I just read in an online synopsis that Henry 'inadvertently reveals that they will be married in the future.' Where exactly in the book does this happen? I have read where Clare seems to know this already ("I grow up and meet you and we get married and here you are."), but I don't remember reading that Henry told her. Have I already read it and missed it, or is this part still yet-to-come? Thanks!