Protect your purity kinda has that trope
The Boundary of Delusion kindaaa
Love rivals to lovers
https://www.mangago.me/home/mangalist/3112573/ Here you go dear, enjoy!
https://www.mangago.me/read-manga/inner_beauty/ "Inner beauty" basically the mc gets dumped by his girlfriend because she starts dating a new guy, and well i wont give spoilers but you can get an idea what will happen btw the ex and the new boyfriend
Any stories where 2 guys fight over someone only to end up togehter? Like love rivals to lovers? No thinks though thanks