Ethan Slater and his ex-wife Lilly Jay are not rekindling their romance following his split from Ariana Grande. A source close to Jay denied the reconciliation rumors, per TMZ, insisting that Slater, 34, and his ex-wife, 31, are 'absolutely not' getting back together. The insider also told the outlet that, likewise, Slater is not trying to get back together with his ex. The former couple's relationship is 'strictly about coparenting' following their divorce, which became a spectacle due to Slater's relationship with Grande later making headlines. The Daily Mail has reached out to representatives for Slater and Jay for comment. This comes…