Past Girlfriend Contacts Me After Over 30 Years

I really don’t know how to put this but we dated awhile, 6 to 8 months when I was 19. She was 15. I met her parents and they approved, still could have been statutory r**e but I didn’t know what that was back then.
We were crazy about each other and we broke up for a silly reason which I won’t go into. We never had piv sex. We both wanted to but I was very hesitant, I was crazy about her and she was a virgin.
She contacted me on FB and we started messaging each other daily for several weeks. She told me she and her gf were talking about old BFs and I came up. Later she said her gf started laughing because she went on about me so long and never told her about any others. After that she started thinking about me all the time and had to contact me.
She is happily married but told me their sex life was over for a long time. They have a place on the water not far from where I live. We live in different but adjoining states. Long story shortened, she wants to get together when she’s coming thru town. She hasn’t come out and said it but told me she REALLY wants to see me. She used caps.
I’m also in a sexless marriage and I am so excited about her interest after all these years. She is still gorgeous. Am I about to make a huge mistake or what?