>Anyone dated both on-board and off-board and seen the same pattern?
Yep. Pic related. Better question is why imageboards attract cluster b people in the first place. The silence about current partners, the vanishing acts, the reappearances years apart, those are features, not glitches. I had someone who resurfaced in my WhatsApp/Telegram messages every six months to a year or so. Recently cut them out for good and feel much better.
>vanish for a few months, come back later like nothing happened
>Ask for something ordinary and they either dodge or go silent
Someone who leaves long gaps and then bursts back in often does it when an existing relationship stalls, ends, or becomes emotionally empty. You're just a validation backup for them.
Also, just date regular women you meet irl. That's the best advice I can give to people here. Don't mistake shared memes and anime for real compatibility; a lot of the girls here hide serious instability behind the same references we all joke about. They're also much more unstable sexually than we are.