He dated his ex on and off for a few years, I think. From what I've gathered, she died due to heart problems earlier this year. She had a young son, which makes it even sadder. I thought it odd when Temps mentioned on the show that he's never felt the same way about another woman than how he does for Liv. My immediate thought was: wow, huge disrespect towards your late ex, and didn't you date Liv for all of five minutes?!!
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I remember how he'd started on MiC a couple of months before his ex passed and he didn't say a word about her when she died. No mention on social media etc, just carrying on as normal on the show and having a good time. It seems very odd that this is the first time he's actually mentioned her, and as you say, feels hugely disrespectful towards her memory, especially after him saying Liv is the first woman he's felt so strongly about.