Okay, so if he is saying that he has told the truth and you also feel that you are not interested anymore in what he was doing and saying, then you need to let that go...
It could be that you feel he is keeping something from you (now) due to what happened before and the trust level is not the same. Or, it could be due to something real that is happening. Perhaps he is not hiding anything and is starting to feel down because you don't trust him and there is nothing he feels he can do or say to change that.
If he isn't hiding anything now, then that would be the case. One way to determine if it's just your thoughts popping up to make you feel anxious about what could be happening now is to do a thought log:
1. what is the thought or feeling? Ex. that he is hiding something.
2. what triggered it? Ex. my gut feels that maybe he's not telling the truth.
2. what is the evidence that supports my thought or feeling? Ex. well, there really is no factual evidence, just the way I am feeling. This is the important part because you need some evidence to really know that these thoughts are to be listened to. Otherwise they are just thoughts and could be due to trust issues from the past.
I cannot tell you if your gut feeling is the truth or your husband is telling you the truth. All I can tell you is that without evidence, I would try to not buy into the thoughts as being facts. And move forward in your relationship. By the way, evidence would be something like a text, or an email or phone calls, etc. Try the thought log when those gut feelings come up and see if there is any real evidence to support your feelings. Please click ACCEPT, so I'm credited. thank you.