Everyone has a past. Past relationships, past choices they are not proud to share. Ty had major life events he was too ashamed to share with Ashley, initially. He made her life grand and wrote a plethora of love. They got pregnant and shortly before the baby's birth, his secrets began exposing themselves. Ashley understood these as "the past" that we can't change, and grew to understand Ty's shame. She forgave him, they grew together.