OP means original post or original poster. That would be you :)
I think it might be helpful to read some of the other posts on relationships. Stop back here, to this post, and let us know what you gained from your search.
Its normal to blame yourself after being betrayed. But it is so unhealthy, and so unjustified. In time, you will realize how little you, or anything you had done, caused your husbands infidelity. You need a grip on this before intering this dating world. It can be rough out here... You want to be able to have fun! Not sit, bitting your nails, wondering why some guy flaked out on you. You want be stronger than that. And you wll become strong in time.