Having heard several divorce stories, I read your comments two ways. One where he is the problem. One where you may have left him with little communication or understanding of what happened to destroy the marriage. Since you have areceived many answers for the first way, I will take the other route.
If he wants clarification for what went wrong, try to answer as objectively as you can. Most couples turn into their worst selves with people who push their buttons, sometimes unknowingly. Sometimes people assume too much by a lack of truthfulness and openness. If he hasn't gotten clarify, think about how to state it without making it seem like he is all the fault. Sometimes, people are just poison to each other and make a great fit for others.
My brother, for example, doesn't seem to be able to acknowledge his part in things, nor does his wife. While they ignored my pleas to get not only marriage counseling but individual counseling as they both had areas that would drive most people nutsy. They are divorcing now and neither is seeing their side of things and I fear that they will carry that to their next relationships unless they truly find someone who doesn't care about it. The fact that he "threw" you out doesn't say it all. What he threw you out for may be important.
Do remember that apologizing with a "but" on the end doesn't qualify for an apology. Have you lied (for any reason)? Have you neglected to be open? Have you refused marriage counseling? Are you demanding or a perfectionist? If any of these are true, you could admit them to give him some closure. "I don't know why I feel that or do that" is acceptable only if true and you are seeking understanding.
So, please take no offense. I was just trying to be helpful in case it might apply.