“Everyone is kind to someone they meet for the first time. The question is how long their kindness lasts. Don’t be fooled just because someone is nice to you at first.”
— The Things You Can See Only When You Slow Down: How to Be Calm and Mindful in a Fast-Paced World by Haemin Sunim
Only time will tell what someone's true intentions are, so don't hastily trust nor dismiss somebody based on a couple of initial interactions.
Be open-hearted, but also beware.