I would consult with a lawyer before publishing anything about your deceased Ex. If you publish something his family could consider defamatory, you could find yourself embroiled in a messy lawsuit.
If you decide to not get the help of a professional writer or editor, I do highly recommend working with at least a proofreader. I proofread everything I write several times over several sittings in multiple ways. I read each manuscript aloud in its entirety, and also read the manuscript backward (this is an old proofreader's trick). I have several other people read my manuscripts as well and offer suggestions, comments, and criticisms. Not to be mean or anything, but I noticed several grammatical and syntactical errors in your post. Not having read anything else by you, I'm not going to make any judgments about your writing ability or style, as I know this could just be a factor of writing quickly for an informal post. Personally, I reread and proofread my posts, too. (I still sometimes end up with typographical errors that I miss, though, which is why it is so important to have at least one extra set of eyes review your material).
Whatever you decide to do, I wish you the best of success with your endeavor. Even if you never publish, just the act of writing about your experiences can be very rewarding and therapeutic.