Oof.
I agree that i don't know if its addictions but more of a character thing. My ex is/was the same way when he was using, and not. When he was using, he had full on affair and left me for her. Sober he continued to use dating appa and talk. A therapist i went to said its a love addiction. I believe its a case of that, and adhd. He gets a hit of dopamine everytime he gets new attention, or old attention becomes new again. It explains why he's also prone to binge drinking, because he needed alcohol to boost his mood, until it depressed him.
If you read my post history, you'll see the timeline of our relationshios demise. I wasted years with this guy. Nothing got better other than him getting sober.