Laurel and Nicole met and fell for each other during The Challenge: Invasion of the Champions. But now, it appears that the Champ and the Underdog are no longer together.

"Some things aren't meant to last forever, they're just there for that time," Real World: Skeletons alum Nicole captioned the photograph above with the Free Agents winner. "So let it be and move on, learn and grow from it. Every new relationship teaches you something take the positives with the negatives and use it as you please."

Nicole -- who gushed about commemorating the lovebirds' six-month anniversary back in May -- shared the same image on Twitter and added the message, "At the end of everything I just want to be happy." Fresh Meat 2 veteran Laurel has not yet commented on the relationship.

Share your favorite Laurel and Nicole memories in the comments, and keep watching The Challenge XXX every Tuesday at 9/8c.