Robin Jones Gunn 
I Promise (Christy and Todd: College Years Book #3) [EPUB ebook] 

Todd and Christy have different ideas about how soon they should marry and what direction their lives will take after their wedding day. As advice pours in from all direction, Christy wonders if their relationship will survive the strain of outside influences. Not only does she have a wedding to plan, but she’s also striving to pass her final college exams in order to graduate. In the midst of it all, Christy discovers a startling truth about herself and her love that makes her wonder if she can promise Todd forever.