Wherever You Go
This is certainly a unique form of the love triangle, and I think that it's development and resolution are perfect.
Wherever You Go deals with so many issues, but it does it well. The characters realistically struggle and come to terms with grief, depression, caring for your family, absence of parents, Alzheimer disease, love and loss.
I love the character of Aldo, Holly's grandpa in this story. He is a perfect door for the ghost of Rob to have a voice in the world, and he has much to offer even if he is frequently locked into himself.
The story has an amazing ending, and wrapped things up better than I could've hoped. Contemporary and paranormal fans alike should give this a read.