Visits home provide opportunity to reconnect to relationships he had when he was single. If you do not maintain friendship connections forged prior to your marriage, your envy may involve a reflection of this difference between the two of you. It is natural for you to have some feelings of jealousy about women your husband is friendly with, and it is important to talk about it, which you are doing. So far so good. But, more than just knowing you can include yourself, you may need your husband's reassurance as well.
Nothing can replace the connection felt and kept alive by appreciative communication.
If he is able to hear you, reassure you and include you, your couples' bond will be strong and secure. But you must also be empathetic to his experience, as well. Instead of trying to mind read your husband's feelings about including you, ask him about his feelings. Establish a safe atmosphere for open sharing and discussion. Do not interpret one another's responses as rejection, but simply listen and try to understand the meaning of these relationships to him, and the meaning his friendships hold for you.