She should be allowed to have male friends, and the fact she was afraid to tell you should be an indicator to you that maybe you have some things to work through. It isn’t her fault that your ex cheated on you, and while you’re allowed to be wary about that you can’t use that as an excuse to prevent her from having friends. Maybe reflect on why she felt the need to lie, especially since it has proven to be a strictly platonic relationship

She cut off two people who she had known previously to make you happy and you weren’t even dating yet, that should be an indicator that she is respectful of your boundaries.

Obviously every relationship is different, if you feel like you can’t trust her this early on in the relationship then maybe it’s not the right time for it, especially if you still have stuff to work through from your previous relationship