How to reply when you receive a text message from the other party saying that we are ordinary friends?

It depends on your previous relationship. If you are lovers, then don't. Can you watch her make out with others? I can't take it anymore. I can't stand it anyway. I just don't want anything to do with it. If it were me, I would reply: thank you.

If you like her but she doesn't accept you, then in this case, it's up to you. If you think you can, of course you can be friends. If you feel embarrassed, there's nothing you can do.