Ever wonder why guys lose interest in relationships? Things can seem so right one moment, and the next — there he goes! To get the lowdown on this less-than-appealing behavior, we turned to the people who know best — gay men. In this excerpt from Straight Talk with Gay Guys, author Daylle Deanna Schwartz asks men who've been both victim to and guilty of this behavior to explain what's really going on behind the scenes.

Have you had an amazing evening with a guy, shared feelings about a variety of interests, felt intense attraction, perhaps shared some intimacy, and then never heard from him again? Or, he came on strong for months, saying everything you wanted to hear, being the perfect mate for you — then turned cold and distant, or just ended it. Carl explains:

"It's the thrill of the chase, which must be genetically ingrained in the male species. And the run part? Well, that's the old fear of commitment issue. Many men outgrow this stuff as they grow older, but some don't. Learn how to recognize the confident, stable men who don't need to give you a bunch of lines when they first meet you, only to disappear after Date No. 2."