What's the name of that manga?

Hi, I'm looking for a BL manga. It's an omegaverse with a plot regarding fated pair. The MC is a beta he has an ex which left him because he found his fated pair (while they are dating at that ). Back to the present he found someone who looks exactly like his ex (The ML) and turns out it his ex twin. They kinda fall in love but of course the MC has trauma because of his past relationships where the man he loved leaves him because they find their "destined to be—their fated pair" and yeah he was afraid to fall deeper for the ML because he knows he will find his own fated pair too and leave him all alone again. And when they were in the middle of amusement date they bump into MC's ex slash ML's twin brother and his Omega. Turns out his ex and his current boyfriend have the same "fated pair" since they are twin and share the same chromosome whahahaha it's kinda funny because the comments are full of "B1tch got a buy one take one deal"

Please if you got any idea of the title let me know, I would gladly appreciate it. Thank you.