He's compulsively unfaithful.
3 seconds sound clip from the Shadowlands movie soundboard.
You can hear this line at 00:44:47.402 in the Blu-ray version of the movie.
Quote context
[...]
- I ran away. It's always a mistake, isn't it? I mean, you have to face things in the end.
- I left home because Bill fell in love with another woman.
- I see.
- He's compulsively unfaithful.
- And he's sometimes violent, and I guess I haven't loved him for years.
- Only when he's drunk and he doesn't really know what he's doing.
- It's just that he's worn me out. It's the truth of it.
- Joy, look, if there's anything I can do...
- There is. You'll be my friend.
[...]