No. Not at all. Riley is seriously messed up because he wants his life to be something more than vanilla and boring as it is. Nothing that happened to him is Buffy's fault. To blame Buffy would be irresponsible and just plain wrong.
@Percabethisbasicallylife well he was basically saying it was her fault because he wanted to know what she felt with angel and when she was controlled by Dracula, but that’s no reason for him to do that stuff.