I'm sorry it has taken me so long to respond. I'm sorry that you seem to be with a man who clearly cares significantly more for himself and his work, than he does for you. Most guys who really wanted to patch things up would be bending over backwards discussing this issue with their wife and figuring out how to rebuild the trust---this is all behavior stuff that people can to and it isn't 'rocket science'. But his avoidance of it, acting a bit put out when you've tried to talk about it, and his coping with it by trying to ignore it; plus the fact that he really doesn't want you to be with him on trips and doesn't prefer to socialize with you when he is on the trips---this all adds
up to a guy who probably doesn't really love you as much as you love him. Men who have for example, a bit of a narcissistic personality disorder streak seem to act very much like your husband does. Their marriage, their work, their social life, how one spends time, is in the end, all about THEM, their preferences, wants and needs. So they can express feelings of love but relationships basically exist for them to support them, their needs, wants etc. These are not evenly balanced, mutually BENEFICIAL relationship, emotionally.
In the end, women who have to live with men such as this, will try to get them into couples therapy and of course, this usually fails, but it certainly is worth trying, and then trying again and perhaps, again. They do spend a lot of time just wishing and hoping their husband would change, try to figure out what deficiencies in themselves they can correct etc. But if the man has a narcissistic personality disorder or some features of it, women end up feeling helpless and frustrated and quite 'unloved'. So after years of frustration and failure, they either divorce, or stay married and reconfigure their personal life. They start living a roughly parallel life to the marriage e.g., go back to school, travel, figure out ways of compensating for the lack of love in their marriage. They find healthy ways of rationalizing how to extract compensation from the marriage, family budget etc., for having to live in this unhappy situation they have tried to change but can't seem to---but which they really don't want to give up either. In other words, the figure out how to compromise things and yet stay married for things such as financial security, providing a stable environment for the kids, etc.
I'll pause here and solicit your feedback.