To hell with that. Everyone on this board has said something in anger that they wish they hadn't. He's a human being with flaws, frailties and a temper. He took his frustration out on an inanimate object not the girl. This idea he should sit for a quarter of the season is just nuts. I'd have him run a few sprints and tell him to pay for the damages and find a new gal. 3 games? For this? No damned way.
And if I read the story correctly, she's not exactly without fault in all this. One report has her making accusations of cheating on his part. Now, I don't know about the women in your life, but when things go down that road, it's very unlikely that she was calm, polite and reserved when she made the accusations. Most women are...well...just a little agitated under these circumstances.
If I had to guess, I'd say both young folk were a little on edge and testy with one another. It's human nature. No reason to take this and make a national incident out of it. Seriously, not a day goes by in this country without an untold number of couples fighting and saying things they regret.