I don't want my bf to go with his friends
Is there a problem with his friends?
They spend too much time together.
It is wrong to try and keep your partner away from their friends. If you have trust issues you should go get professional help for it.
What's wrong with wanting some alone time? We never spend time alone together.
You need to talk to your partner if you want to spend more time with him, not try to break up his friend group.