You’re so funny, you… 
Why did you avoided quoting exactly the most important part of her comment ?
You see my friend, she was interfering in their relationship all this time. As she couldn’t manage to make him move to her, she came to him. Obviously, he only wanted to bang her again and not much else really, being sure that he can return to Selma at any time he wants ( he was right there). What he didn’t expected, was Selma to get involved with another man, that’s what triggered such a powerful response from his side. The rest is history