Both of them did a worse thing with you like your sister doing this to check his loyalty for you that you never asked and him not saying that someone might be pranking him so he wants to continue this to know who it was. It might be possible that he told this as you caught him and he had no other things to say and your sister might have bad intention towards your relationship and that is why she did everything to make sure that your relationship gets ruined.
Cheaters never change
There is a reason this phrase exists in societies all over the world
You gave her a pass because you deluded yourself into believing it was a mistake on her part and that she was sorry.
Now it has happened again.
And she is trying to manipulate you…AGAIN
Look man…you are her backup plan.
You are the guy that gives her regular attention and wants to be in a relationship with her.
And since she doesn't want to be single…she keeps you around
But if she has cheated on you twice, then the truth is, she has cheated on you with even more than 2 dudes.
Cut your losses and move on
Block her and ghost. You don't owe her anything
He dodged a bullet. Yes your expectations are too high for a guy you just met.
Both of them did a worse thing with you like your sister doing this to check his loyalty for you that you never asked and him not saying that someone might be pranking him so he wants to continue this to know who it was. It might be possible that he told this as you caught him and he had no other things to say and your sister might have bad intention towards your relationship and that is why she did everything to make sure that your relationship gets ruined.
To be fair, your reply is worded in a confusing manner