Hi, I'm new to this but my partner is recently self-diagnosed AS. He is very intelligent and high-functioning. I just found out that he's being cheating on me in a non-sexual relationship for 3 years with a much, much younger woman (And, please, before anyone asks, yes, you can cheat without sex or even romance.) Having given this a LOT of thought I think this is more to do with narcissistic personality traits than AS. He's done online tests for various personality disorders and this one fits best to his characteristics, although I appreciate it's all very fluid. Any (helpful) comments or advice gratefully received.