The pair got married in San Francisco on Tuesday, one week after learning Soto has just a few weeks to live.
"No matter what happens with my treatment, or whatever happens, I know she'll always be there, take care of me and stuff, she really makes me happy," Soto said. "So, I knew she was the one for me, so that's why I proposed. She's the love of my life and I really want to be with her forever."
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The two 20-year-olds hope their love story will give others hope, especially those battling cancer or those who've lost someone to the disease.
Cristobal had this message: Be positive like Sergio, stay strong and live life one day at a time.
They put the wedding together in just one week.
Mission Bay restaurant The Ramp donated the venue as well as food and drinks.
Noe Valley bridal boutique Lace & Liberty donated the gown and the tux is from Men's Wearhouse.
VIDEO: High school sweethearts marry 63 years later
High school sweethearts marry 63 years later