how do i know if my posts about a previous roommate are slander?

i have a blog on tumblr.com that i've used for a little over 7 years. i recently had a falling out with two previous roommmates. i have made a few posts on my tumblr specifically about how my living situation with them was toxic and unhealthy for me. i did not mention their names or any identifying information. i did not link to their blogs. i've had them both blocked on all social media except for fb for a few weeks. i did not call them names (jerk, asshole, etc) and i did not accuse them of anything. someone who knows us all has been looking at my blog, and telling my old roommate about these posts. i have deleted all of these posts, at my old roommate's request. this roommate is wanting to sue me for harassment, because i made posts about them that they found out about. we live in tennessee. would this be a valid case?