Ever story needs an antagonist, and for Holly Weaver and Gabe Quade, this is it! Mr. Weaver is a canon character, and Holly's husband. They don't have a very good relationship, which we kinda get after Holly cheats on him with one of her students. So to complete the little cast of the sub plot 'What's a Poor Girl to Do?' we need this guy. He's not very happy about having his wife going around his back with a student (he just found out), even though Holly suspects him of cheating far before she did and he never pays any attention to her anyway.
You can find out more about him from the sub plot and the canon list.
If you take him I will love you forever and always, and I will make you a cooookie pie =D