She's saying... Don't be tempted to cheat again. As she saw how he reacted towards another girl. She believed that the way he smiled was only ever for her. And she realised she was wrong when she saw him smile like that at someone else. So now she fels hurt and vulnerable. Deciding what to do.
The best thing in that scenario is to leave the guy. If he has vulnerablility to cheating the possibility of it happening will always be there. Therefore, Spare yourself the hurt and pain!
She's saying... Don't be tempted to cheat again. As she saw how he reacted towards another girl. She believed that the way he smiled was only ever for her. And she realised she was wrong when she saw him smile like that at someone else. So now she fels hurt and vulnerable. Deciding what to do.
The best thing in that scenario is to leave the guy. If he has vulnerablility to cheating the possibility of it happening will always be there. Therefore, Spare yourself the hurt and pain!