Sales executive Zach Shallcross and emergency room nurse Kaity Biggar got engaged on The Bachelor finale Monday.

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"I can no longer say I'm falling in love with you, because, Kaity Lane, I am so in love with you. You are my world," Shallcross said.

"The love I feel for you is something I could've never imagined and something I thought a lot of my life I would never be able to deserve. I love you so much. I love you with all my heart. You're the face I want to wake up to every morning. I want to go through life with you and only you. Kaity, I want to be with you forever," he added. "You're the only one I want in my life. ... Kaity, will you marry me?"

Biggar accepted his marriage proposal and a huge Neil Lane oval-cut diamond ring.

Shallcross spent the final week of the reality dating competition show in Thailand trying to decide who he wanted to spend the rest of his life with -- Biggar or Gabi Elnicki, an account executive from Vermont -- and introducing them both to his family.