Whats a party bus like? Is it cheating?

I have no clue what party buses are like, bit ove heard from my sister that its kind of like a bar, where everyone just drinks, and hangs out.

My husband took off work on my bday, but we both ended up getting into a huge argument. I went to my moms place for the night, planning to come back the next night. But he told me not to come back yet, still acting angry about our fight, ignored, and blocked me for 3.5 weeks straight. I thought we were over, so i decided to move on, but all of a sudden, he came, and told me to go back.

I didnt for a few more days, because i was upset that he did that to me. I felt like he went to go have his fun 1st, until when he has had enough, he came crawling back.

Anyways, i went back, and i saw that he had a email from a party bus, hoping he had fun. It was a receipt. And it was 2 days before my bday, at 10am. I ask him about it, and he said its not him. He doesnt have a card that ends in that number. He began accusing me that i was the one that went, because it was my bday. And i used his email to get the receipt.

Idk if hes telling the truth or not, but i just know it in my heart that hes lying. So yeah, whats a party bus like? And he was def cheating on me right?

We were not separated or anything, i just went to live w my mom that night, and i plan it for that night only. But he wanted to extend it.