Is he cheating?

My fiance went out tonight with his brother for a company Christmas party. He said he would be home around 11. Well he didnt roll in till around 2:30am. He ignored my 2 text I sent him. Didnt even read them. I went on his phone and looked up his timeline on his google maps. Sure enough it said he was at the holiday inn from 12:30 till 2:00. I confronted him and he said they were at the bar he wasn't at a hotel. But the kicker is he said he sharted in his boxer and began washing them when he got home. He did show me the stain but this looks really bad. I hate him so much right now I'm laying in my kids room unable to sleep. While he sits in the other room and could give a shit less about my feelings.