Ignore the comment your H made about suicide, a) he most likely won't even remember having said that to you now and b) he was just trying to shift blame to make himself feel better. It has absolutely nothing to do with you and you must remember that.
Your H will no doubt be realising that his life is now not what he thought it would be away from you, they all do that, you know grass is greener, but find out it isn't because they don't get it that it is no one or anything that makes them unhappy, it is themselves and only themselves. That is why you can't think about your conversation with him too much, don't own any of his insecurities or issues.
Hope you have a good day at work. Thinking of you Nell
