drift apart
1. To move away from something slowly, especially while floating on water. I guess the innertubes drifted apart because they're now scattered across the pool.
2. To gradually become distant from someone after a period of closeness. Andrea and I never had a big fight or anything, we just drifted apart over the years, and now I hardly ever see her.
drift apart
(from each other ) 1. . Lit. [for floating things] to separate as they drift. The boats drifted apart from one another. The boats drifted apart in the waves.
2. Fig. [for people] to lead their lives without contact with each other having been together or friendly. He drifted apart from his friends. As the years went by, they drifted apart.