Believers who don't meet often must not be good believers.
"Don't stop meeting, like those who are used to stopping, but encourage each other. This is even more true when I know that this day is coming. " Lai 10:25
Whether a person is a good believer depends on the fruit he bears.
The nine fruits of the Holy Spirit are kindness, joy, peace, patience, kindness, goodness, faithfulness, gentleness and temperance. A Christian who truly crucifies the ill feelings and selfish desires of the flesh with Christ will certainly act by the Holy Spirit, and the fruit will naturally come out of life.