Women say they want a nice guy, but they don't actually want The Nice Guy. Take advantage of this fact by becoming a clingy, soft-spined, groveling coward at every opportunity. Don't make any decisions without her. Pretend to like all of the things that she likes. Ask if she's okay, and if anything is wrong or if you did anything to upset her every 5 minutes. Don't let an hour pass without an "I love you" text. Before you know it, she'll be begging to date a real man instead of the whiny loser you've turned into.