I would call it...
Broken Ends Meet
The thing on the back would say something like:
Ty and Amy have been through some rough times. When Amy comes to Heartland for the summer things are very awkward between them. Amy is torn, she doesn't know whats coming. But when a much loved horse dies, they turn to each other for support.
Basically what would happen is Heather would break up with Ty. Amy is all upset and all because he doesn't tell her. Then er... Sugarfoot dies of old age they are both all sad and it brings them closer together. Then one day they are talking about their relationship lately, and then they kiss! Amy is all confused and upset and yeah...Then they end up getting back together and then they all live happily ever after