Great advice from itsallgrand. Find the true support beams—family, friends—for grounding so you're not consciously or subconsciously trying to find support from a source (him) that has proven far too wobbly and unhealthy to lean on. If they're not around in 3D text someone, call someone, be vulnerable with the people who can nurture you. Get those connections established, so the netting is there. We're here too. Hoping your day has gone as well as such days can go.
Answering your personal question about healthy relationships: Yeah, I've found them. And lost them. A few times. I feel lucky, I guess, in that my early, formative romances were healthy. I could riff on all that stuff plenty, but don't want to hijack this while you're in the fire, perhaps searching for immediate footholds. If you'd like some more detail, I'm happy to provide. Short answer is that I've found them when I wasn't ready, when I still had some personal knots to untangle to be really open, really available.
For better or worse, I have a very low threshold for drama and inner turmoil, at least when it involves another person. I have an appetite for it for sure—and the weird entanglements to show for it—but not for sustaining it, building relationships through it. With the exception of one very toxic relationship that came during a very toxic juncture in my own life and self-reckoning, I've only gotten into committed relationships where there was a sense of ease—sometimes, maybe, too much ease on my end while someone else was spinning around. That those "easy choices" led to plenty of anguish kind of kicked me to work on some of my own wiring a bit.
I'm in a relationship now. It's healthy, profoundly so. Could riff plenty there too, but it's really pretty simple: I'm in it because today is better than yesterday and I'm really excited about what tomorrow will bring, with her. I don't need to break my brain to keep it stitched together. Leaves room for the heart and body to do their things, guide the ship.
I don't know about you, but what I've personally liked about this site, on the few times I've posted about my life, is that the act of posting kind of affirms for me that I've stumbled into a swamp. Ugh. But life. Then that gets confirmed and you kind of have only one direction that makes sense, regardless of what the head, heart, loins, or whatever is magnetized to.
Sometimes we need to stumble into swamps to recognize clearings. Part of the process. This is six months of your life. It doesn't have to define you or throw you down a rabbit hole of reckoning. It can just be something icky and unfortunate that you got into that shined a light on some parts of yourself that need some self-care. But for it to be that you have to lean into yourself for support, not someone who has well proven himself incapable of supporting you as you need.