The congregation forgets its first love by forgetting why we are attending church. We start and are misguided to think church attendance, singings, meetings, furniture, looks of the church and everything associated is the true meaning of church. We attend church to worship and praise God, to build up our physical bodies which have been drained due to service for God, and when we put I ahead of God things start falling apart.
The lack of love for each other and God shows up by not caring for one another, not having time to serve one another and God ( a good indicator that the world is becoming first in your life ), and the lack of serving your local church.
To gain this love back, and I can only put it this one way, PUT GOD FIRST IN YOUR LIFE!