Do you do anything together with your husband?
What I mean, is sometimes you want to spend time with him, but don't have anything to talk about, so it's very frustrating to have a conversation.
Mr. A and I frequently play games together or watch movies "together". It's nice to hear his voice and laughter and spend time with him even though I have nothing new to say. We also cam and have phone sex to keep a "physical" aspect going when we can't be with each other.
I would say that the time he's spending with his new gf would not be an issue if you felt like all of your needs were being met? If you try to fix the problem of not having those needs met, you will be surprised at how the time he spends with his gf will become less of a problem for you.