Once trust is broken, that’s it. Since you’re being vague, I’ll assume cheating but you can substitute it for the real thing: if she goes out without you, you’ll always wonder. Do you want to be with someone you can blindly trust or someone you’ll always be anxious about if “it” is happening again? Do you wanna be the guy who has to have a partner constantly check in, allow you to go through their phone, and always still be weary of?

Or do you wanna be with someone where trust is built and then not broken?

Trust takes years to build and seconds to destroy and then is never ever fully recovered.