You aren't just feeling left out, you are being left out! You are also feeling deprived.
Your husband spends time with work-mates, especially female ones, and seems to avoid contact with you. Life with him is like begging for crumbs. I hope you realize that you are giving him all the power to feed or starve you. You ask for his attention and sit home waiting.
Have you considered going out and getting your needs met elsewhere by making friends, taking a course, joining a club. He's taking care of his needs, but you aren't taking care of yours. He isn't the only game in town. When he realizes that you aren't going to waste your life waiting for him, he will respect you more and take your needs more seriously.
The fact that you ask if you're being unreasonable tells me just how unentitled you think you are. You are supposed to have your needs met and you are supposed to be with a partner who makes you feel that your needs are important to him. He isn't treating you properly. You aren't going to be a position to ask for more or better treatment until you feel more entitled.
The best way to get more entitled is to get some therapy. In therapy you will come to understand why you accept so little and think that you are unreasonable for wanting what you want. When you feel better about yourself and more entitled to be treated with consideration, your husband will know that you mean business, which will make him take your requests more seriously.