its hard to imagine the woman you love with anyone ealse. but especially against her will. if i were in that situation i would try my best to put my anger aside and take care of my girl imagine wat she is going through.
How do you know he tried to rape her? If he did, she needs to report it. But make sure you're not jumping to conclusions. Let the police handle it.. as angry as you are, it's still not your place to deal with him. :)