My ex-partner lives in LA, California and I live in Madrid, Spain. Two years ago, we decided to write a book of our story. We announced it on Facebook and other social sites. Four months ago, he broke the relationship and I decided to write the book alone (including nothing of what he had written) and I plan to publish it on Amazon.com . Also, we had decided the cover pic -of both of us- taken with his camera. We never signed a contract or agreements. The only proof I have are the WhatsApp texts and the emails that we shared to discuss the book.
My questions are: Will I be in trouble if I publish our story? if so, changing the names would be enough? Is there any advice you can offer me about legal issues?