Get rid asap, its just not worth the hassle. Short term pain but long term gain. If this guy isnt even willing to communicate face to face or turn up for rehearsals then whats the point.
Ive been in good bands that have been torn apart by arrogant, egotistical singers/guitarist and troublesome wifes/girlfriends and it just does not work out. Cut your losses mate, either get rid or find another band where everyone is rowing the same boat👍