I found out that they are called Shane Simpson and Alfie Tolcher.
Shane's (the Black guy in the back) Twitter seems to indicate that he is of Jamaican and Indian descent. He has a number of social media accounts:
Instagram
@shanesimpsonn
@ShaneSimpson__
Tumblr
@shanesimpson
Twitter
@shanesimpsonn_
TikTok
@shanesimpsonn
Alfie (the White guy in the front) seems to be a gymnast (as well as his brother Freddy). He also has some social media accounts:
Instagram
@alfietolcher
@alfie_cheer (seems to focus on his gymnastics)
Twitter
@AlfieTolcher
TikTok
@alfietomtolcher
It seems they've broken up. There is no hint of their relationship in their accounts. The only evidence we seem to have that they were together is the pic on top of the thread that became a meme and the pics saved in three fan accounts I found on Instagram (@shaneandalfie, @alfie_shane_, and @shanexalfie._).