My husband isn't where he says he is.

My husband has been coming home from work really late lately claiming that his boss was making him work late. On the second week of this happening, I texted a friend of mine who also works there to see if everyone had to work late and she said no, they had all left hours ago. So the alarm bells in my head start going off so loud. When he cane home eventually I asked him where he was and he LIED and said they were working late again. So today when the time came that he should have left work I tracked his phone with the Apple ID (I know it's so bad and crazy but we have two toddlers at home and I don't want to be played). It tracked his phone to the parking lot of a 7/11 about 5 miles from his work. I keep periodically checking and it's still there two hours later!! What can I do here? How do I confront him about this without telling him I tracked his phone?? I can't believe he's been lying to me. He has always said he would be 100% honest and I'm crushed he isn't telling me what's going on.