Am I an asshole for befriending a friend's ex?

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i don't really know how to feel about this since if my friend was to find out i don't think he'd pick it up in a good way, but i genuinely do not want her. she's a nice gall, good looking but she's still an ex of my friend so i don't want that.
but i have a hard time in general talking to women, i'm autistic. so having a female friend to talk to in a normal way helps a lot. and even i know women like men who hang around women. or as they sometimes say it men who've been "inspected".
Am I an asshole for befriending a friend's ex?
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