On and off dating in the past

Have you ever dated someone on and off over a length of time but then broken up and found your person/current partner? What are your emotions towards the previous person now and were you able to fully move on?

Context (and yes I’m an overthinker): I’m going on a date with a guy on the weekend who seems perfect, but after some insta/fb stalking, it seems he’s had a long term on/off thing with someone that may have ended only recently. Not sure if it’s a good idea/I should give him a chance