Why would a woman with a past failed relationship suddenly switch to waiting till marriage?

Anonymous
My older sister was in a long-term relationship. We never liked the guy but she refused to listen. He strung her along for years. We were all right the whole time. He was a bad fit.

She got rid of the loser but he wasted practically all her youthful years. She's now 29 and has been dating someone else for a couple weeks. She suddenly switched to waiting till marriage. She was ok with intimacy in her 1st relationship so why that change on her 2nd?
Updates:
24 d
She suddenly wants to go old-fashioned. She is treating her 2nd relationship (2nd guy) different from the 1st.
Why would a woman with a past failed relationship suddenly switch to waiting till marriage?
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