Honestly Hope, this is a common concern with a lot of women, not just you.

What is HIS history? Even if a person is divorced or broken up from another person that person may have never cheated on their ex. Also, just because a guy is a flirt sometimes, it doesn't mean they are a cheater.

It's understandable that you worry though given that you have experienced having someone cheat on you in the past. It's important to keep in mind that it doesn't mean you are not good enough or attractive enough, often it's all about the cheaters ethics and ego.

That being said, just because other women have been forward and flirty with him doesn't mean he would actually be interested. Most men tend to not be attracted to forward flirty women, instead they tend to be more attracted to a woman they feel unsure about that isn't up in their face so much. You don't just roll over for him either, you have boundaries and men tend to be more attracted to that in a woman. There is a lot more involved in his attraction to you than your haircolor, believe me.