I feel I need to leave my friends behind when I am on a date.
Why do you want to leave your friends with your date.
I'd rather spent time alone with my date.
Your friends will feel slighted if you ditch them in favor of your date. Have a fun time together with your friends and your date.
I think my friends are too boring for us.
Normally people don't bring their friends along on a date. If you think they are being too boring you can finish off the date and plan the next one alone.