How to move on from catching my boyfriend chatting?

My boyfriend was chatting - cyber sex, girls of all ages- for about a year, until I discovered his habit, and asked him what was going on. After denying the situation for months, he came clean and felt very bad about what he did. We’ve been trying to get over it since, and I do love him very much, but I feel like everytime I turn on the t.v. I see women in provacative situations, or everytime we’re out in public, I find myself noticing every attractive woman around, wondering if I am more attractive, or if he thinks I am. I have also been considering breast implants, … all in all, this situation has made a mess of me!
But most importantly, I have been reading into this sort of behaviour, and the ideas that keep arising in books, t.v. or on the internet are that men are more biologically inclined to cheat, no one woman can satisfy a man fully, etc etc..

this is all turning me off of sex. How can a woman really enjoy sex knowing that her partner may not continue to be faithful, or could perhaps be thinking of another woman?

How can a woman enjoy life knowing she will one day age and her importance in a man’s life will fade alongside her looks? I know I sound depressing but these are the messages being sent out by the media.. how does a woman cope with all of this?