I saw this on TikTok and it made me so sad :(

You are dating (love interest). The two of you had plans to go on a date one night, but they canceled the plans last minute. At first, it seemed like nothing, but then there was the realization that they'd kinda been drifting apart from you recently. So, curiosity got the better of you, and you decided to check on them that night just to make sure they were okay and to have a talk with them. Unfortunately, when you go to their dorm, you find them with (enemy).

What do you do?