SO thinks I don't want to have sex with him!

So idk what has been going on with me but ever since my last period that just ended 4 days ago I'm just not as "frisky" as I usually am. Also our 2 year old is starting to pick up on things. For example, in passing my husband was know to squeeze my butt or cup my boobs and I have noticed that our daughter has started to try to do the same. So I've been asking him that we need to tone down the PSA while in front of her but i think he's taking it the wrong way. He got really upset again tonight and said I don't want to have sex with him which is NOT true! 
Also, I honestly do not know what is going on with me but I just haven't been in the mood. I think it's because I'm up to my ears in schoolwork. I suggested we have a date night or have a mini romantic night but now I'm afraid if I keep telling him that I'll become a nagging wife. UGH!! I do not know what to do.