I'm not going to invest much time in a long standing friendship
Do you mean you'll never invest time in any of your friendships?
No. But I'll invest much less time in my friendship
It is expected that people will try and invest time in friendships. You should try talking to your friend and see if you can work out the problems you are having.
I will never talk to them about it.
It is your choice, but you should not be surprised if the friendship is lost in the long run.