Aaron, who showed up to Bachelor in Paradise's eighth season as a duo with James, shared his reaction to James' new romance in a funny TikTok video.
Aaron wrote, "James is taken. Taken away from me," along with a sad face.
In the video, Aaron wrote, "Trying to hang out with James now that he has a GF," over footage of him mouthing the following dialogue: "He doesn't want to. Tell him. I already told him. Well, tell him again! He already said no. Well, make him say yes!"
Aaron created the TikTok video after fans teased him about losing James as his partner in crime.
"Someone check on Aaron Clancy," one fan wrote on James' relationship announcement.
And another Instagram user commented, "Aaron is really rocking that bikini!"
When James debuted Rebecca to the world, she was showing off her lean body in a bikini, and James was flexing his muscles in swim trunks.
"HAPPY BIRTHDAY @rebeccamarriee. I am beyond grateful to have you in my life and I am truly blessed to be able to share this special day with you, and many more to come," James captioned a photo of the couple kissing.
He continued, "You deserve all the happiness that the world has to offer. I love you."