I feel that way with a best friend from college. I don't feel the same connection anymore nor trust him with telling the details of my life. We're are just different now and don't understand one another. Seem to get into more fights (more than my ex).

The friendship is kind of fizzled out in my mind and I'm pretty sure it is in his. I was best man at his wedding as an ode to the friendship we had in the past but in my mind I know the friendship has fizzled out.