It all started in the titans revival issues when raven got her new body and she started having feelings for Gar. I like the concept and those two together, but the relationship has been going on and off for a few years and it's getting annoying. The writers can't seem to know how to write it out apparently and now it just seems like a "will they or won't they". They always seem to do the beginning and ending of the relationship, but they don't write out the meat of it all, you know?