herb-gal
How is he supposed to know that she would have sex with him? That's probably his way of bragging about marking his territory/sleeping with her, without getting in trouble. Either that or he's tried and she turned him down.
To reiterate what was said earlier, he wouldn't have said you would kill him, if he didn't know he was doing something wrong.
If he is going to have ANY girl's picture displayed on his personal web page, it should be you. He needs to realize that, and you need to realize that.
This is not a jealousy issue. This is not a molehill to mountain situation. This is not negotiable. Your boyfriend is being a jerk, disrespecting you, lying to you, and trying to turn things around on you to guilt you into thinking you shouldn't be upset with him.
I don't want to tell you what to do, but if even after you explained your feelings about it, he kept the picture up there, you should definitely consider proving the seriousness of the situation by taking a break from him.
Have you found out what this girl thinks about him having a picture of her up? I think there is something deeper going on here. Any self-respecting female would object to having her photo displayed on an attached male's webspace. If it's jsut a case of being young and stupid, then it's no big loss, right? You'll get over it if you leave him.
Worthwhile men at least know better.
He's not worth the embarassment that he is causing you; and it's ridiculous and apalling that he would continue to put you through that.