What Causes Behavioral Changes And Memory Loss While On Welbutrin?

My husband was put on an anti depressant named Welbutrin and turned into an absolute monster. We had been happily married 18 years, have four incredible children and a comfortable life style, great friends, social engagements a strong christian faith...He was a great father and provider and suddenly I didn't know who he was. He subsequently had an affair, rented an apartment and doesnt' remember large portions of the 3 month period.Any suggestions as to why this would have happened, why Doctors wouldn't listen to my pleading and how a couple would heal from this? I cannot get past it.