My husband think it's okay for him to stay outside until 2 am without letting me know?

So my husband goes to the gym sometimes at night, he leaves at 9pm, after putting the kids to sleep and then only come home around 1 30 or 2am. I asked him a million time before to let me know, if he is going to do something else after the gym but he still doesn't communicate. He loves smoking hookah so he goes to see a friend or just by himself. We had an argument today and he think he doesn't need to let me know.. he claimed he forgets and it's really not important. I don't know what to do with him.

My husband think it's okay for him to stay outside until 2 am without letting me know?
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