sack tap...

Okay so I've been dating my boyfriend for almost 2 yrs now, and we have these friends who are married and she recently admitted to her husband that she has feelings for one of his friends and that they've been talking about how she doesn't love her husband anymore. So anyway long story short they were getting divorced then not, then going to couples therapy, then getting divorced and now they are completely fine...I guess.  So anyway I work 3rd shift and I was sleeping before work and didn't know they were both at my house hanging out with my boyfriend and I guess the wife (she's 28) decided to sack tap my boyfriend. Am I allowed to be pissed at this? I mean maybe I blew it out of proportion but I'm still upset about it. Any girls out there that would be pissed too? (I'm 22 and my boyfriend is 26)