Bothered by his affair with Isabella...

It never happened in real life. Isabella was only 9 when Wallace was executed. I agree with you that it likely would have been better to portray a more subtle relationship between the two, but it's a movie, meant to entertain and not to be historically accurate. Also, to be honest, I don't think (in the movie) that Wallace loved Isabella, at least not in the way he loved Murron. Isabella reminded Wallace of Murron, and so he slept with her, and likely felt some affection for her, but that's it. In the end, he was not willing to stay with her and preferred to die and go to Murron (in the execution scene, they show Murron walking among the crowd, and Wallace's happy reaction that soon he'll be with her).

She lusted him.. he lusted her.. its a movie.

He changed after Murron died could no longer be a simple peaceful man living out his days.

She helped him, She seemed to be understanding to his cause, He knew she was into him. More then he was really into her... and one thing lead to another.

Doesn't bother me at all. Makes sense she was chasing him and he went along with it because of lust and her helpfullness to his cause.

I could not agree with you more!

What drove him to such exploits is supposed to be his love for his murdered wife, Murron. Under the circumstances, the LAST thing he would do is sleep with another woman and soil her memory and his love for her. And the last thing his vision of Murron would do is smile at him during his execution, because the whole depth of their connection had been rendered pointless and hollow by the fact that he had had sexual relations with another woman.
I shake my head at that every single time:viewers have to be utterly stupid to feel that his connection to Murron had any sort of value at that stage. And that 'stage', mind you, is supposed to be the peak of the movie. Talk about a major flaw on what was otherwise a very good movie.

He needed to gain back his humanity. Isabella showed him he could settle down and have kids. WW said this to someone else. That's why he agreed to meet RtB at the lion's den.

It always bothered me as a kid as well because he told Murron I will love you my whole life, you and no other. I guess he hadn’t had any action in a while and honestly you’d have to be gay to reject Sophie Marceau (cough cough)

Okay, Boomer 😉

It's dumb, because Isabella was 4 years old when Wallace's rebellion took place, and she spent the entire time in France. She would have never come near him, even if she had been an adult and in England at the time.

Basically, this entire film was an ego trip for Mel Gibson, and he wanted to be the tragic hero that slept with all the beautiful women in the film, and both he and the princess got revenge on Longshanks by getting her pregnant by his most hated enemy, which never happened in real life. I'm sad to say this, but 80% of that movie is fiction.

Her relationship with Prince Edward was nowhere near as nasty as what happened in the film, and she had no reason to sleep with other men besides him. While history does hint that he may have had a male lover, Edward was not a wimpy little faggot that slept exclusively with men and hated women like the guy in the film. He was actually a warrior and produced several children with Isabella before he was deposed. If he had a gay relationship, he was extremely discreet about it, or we would have heard about it from tattling historical documents by now. At worst, he was bisexual and not a well-liked king, hence why Isabella did a coup against him later on.

The affair is bad enough. Her having his baby is just off the charts.