I dont think they get lonely, most breeders will keep females together and males singularly. If you watch your geckos much in the evenings you will notice how much the males pester the females. Its not nice to watch when your female has just carried and laid 2 HUGE eggs, not eaten for over a week as there is no room for food in her abdomen, gone through the stress of laying, skinny........ then the male comes along and attacks her and tries to mate, the poor females will hiss and squeal in distress while the male is biting and holding on.
trust me...... i was all up for keeping mine together as a pair until i witnessed this. It is very distressing for the poor females.
Needless to say, i think she prefers being on her own and does NOT miss him as her company.