Short and sweet will be my words.
Before you blink your eyes, you will have the point. Statistically, the average man adores and loves his Mother. He treats her with the utmost respect; he is very protective of his Mother. If he treats you with similar outpourings of love and kindness, he may be a keeper.
However, if you are dealing with a man who is disrespectful to his Mother; uses profane language to her; is not attentive to her needs; does not remotely assist her; does not frequently visit or talk to her; has physically struck her, I extend the greatest caution to you! He is probably not what you want.
Simply put, if he is not right and loving to his Mother, it is highly likely that he will be the same way with you! It will only be a matter of time before his ugliness raises its head, if it has not remotely happened already.
Little or no discussion is required on this topic; it really is self-explanatory. If he doesn’t respect or shower his Mother with love, neither will he respect you.
Don't second guess his behavior; don't tolerate his excuses for his misconduct. Do get out of “Dodge” as fast as you can!