I feel sympathy for her. She was meeting men who were manipulating her emotions for their own ends. The first fellow led her to believe he was available when he wasn't. If she wanted exclusivity, she was right to end it. The second fellow seems like a professional scam artist, and she was right to not buy into his scheme. The third sounds like he just wasn't that into her.

Maybe she should try meeting someone through more old-fashioned avenues, like weekends at a resort or something. She sounds like enough of a "cougar" that she ought to be able to attract the man she's looking for. I have one phrase of advice: "Guard your heart" like you guard your house until you can confirm that he is who he says he is.

Better yet, put more energy into meeting men in person at a social gathering of some kind. (But not at a bar!!) Church, a club, parks and rec, volunteering, whatever. It's easier than over the Internet and gives you a chance to 'size up' someone and talk to them a bit in a safe place, before you become emotionally involved.