What do y’all think went on??

Today I had throat surgery I was gone from early this morning till 4 in the evening. When I got home my boyfriend wasn’t home. He goes to college but he’s usually at home around 2, it is now 7 and he’s just coming in. He walks in kisses me and heads straight to the shower, claims he made a new friend and wants to take a shower cause he smells like HER house. I’m not sure what to make of this. Am I being paranoid?