Got shake by a cheater? after all he did, hell nah, hope he's lying cuz eew

I was confused when ml was blushing around mc in the past so I thought there might’ve been something there (like a secret little crush or something) when ml admitted yeah he has a secret but then he started talking about his past relationship with his ex and that gave me the ick, then going on to talk about how they’ll protect each other from either one’s exes like wtf.
And boy, wtf do you mean you still like your ex or whatever, ts piss taking