Very true...
It doesn't happen between the change in 'worldly life' to 'spiritual life' only. It also happens when you change from one home church to another church, or as for myself, when I had too many Christian friends the Muslims ones stayed away from me, and when I had Muslim 'modernized' friends, when they knew I'm going spiritually inclined, I lose them too. As for today, I don't have more than one finger to count as a friend in my country. One goes off, God sends a new one. The cycle repeats. So, it teaches me to welcome whoever comes next.