Well… you already know this has little to do with dietary cultures, and little to do with actual philosophy - that’s just a cover. It’s also not about emotional intimacy, as you rarely eat together anyway.
Being that recently your 14 year marriage ended, this is about using this person like some people use junk food, or comfort food - to avoid painful things like loss, grief, shame, fear of dying alone, etc. However, if you don’t actually feel your pain, and heal your pain, you delay the wisdom that comes from healed pain. Up to you of course. Many people are junkies when it comes to denying the shadow and engaging in dysfunctional relationships.
Psychologists estimate that recovery from a significant breakup/divorce takes about 3 months for every year spent in the past relationship - in order to process it, re-integrate the self, and be able to show up to actual, sustainable intimacy. So, even if your long marriage was crappy or deceitful for some years, you still have to go through a few years of processing/solitude/therapy to get your head & heart on right before you’re actually ready for a real relationship that serves a higher good rather than simply using a warm body, etc.
So, at least be honest with yourself that you’re indulging in an entertaining rebound entanglement that is likely to generate harm one way or another , because human sexuality isn’t ever really casual - particularly for females in this culture - it has emotional consequences and can even make babies.
It’s easy to misuse intimacy, frequently people do just use each other like a bag of chips.
However, as our ancestors knew and believed - and as I personally do - we’re not just our physical body, we’re also a heart and spirit - and there are relationship/entanglement behaviors that are the equivalent of junk food bingeing and emotional vampirism/stealing.
This is not so much about vegan vs. keto, it’s more about filling your void with what’s easily available for whatever reason. Like Maya Angelou said: when you know better, you do better. Do better.