Close with you're friend's friend..

Friendship never ends, and it's true. You can be friends with your friend's friends. I know it's quite confusing but here's the tip:
1. always be friendly
If you're friend is with you're friend's friend, talk with your friend's friend. talk nicely and try to be friendly.
2. communication
It's important to communicate and talk with her/him, you can know each other fast if you communicate.
3. ask he/she to hang out
If you're friend is hanging out with your friend's friend, go with them. It will help you to know each other.
4. Collect informations
If you feel you're not match with your friend's friend, try to collect informations about the things she love.