First I want to say I am really sorry you're going through this right now.
I know it's early on for you but you have to start to understand that these changes are for you for future relationships. Now a future relationship could be with your ex just likely not now.
You could turn into James Dean or James Bond overnight and it likely wouldn't matter.
Also, just so you are aware that is not the strength you are reading about. The strength you are reading about is the important strength. It is the ability to let go of someone you love. It is the ability to walk away from someone who is unfaithful to you. It is the ability to be a rock for your children in these tough times. It is the ability to say I love and value myself enough to let someone treat me this way.
Chin up my man I know this is really hard. I remember I couldn't handle watching Christmas commercials because they were all ridiculously family oriented.
You will lead a normal life again no matter what happens.