Tattoo Trouble: A Relationship Dilemma

Am I wrong for walking out after I saw the tattoo? We'd been seeing each other for eight

months. Things were getting serious. Last week, he invited me over

and said he had something to show me. He seemed nervous, which wasn't like

him at all. He lifted his shirt and there it was. A massive tattoo across his ribs.

Her name. Not mine. Some girl named Vanessa I'd never heard of.

I froze. He started explaining how it was from years ago, how he'd been meaning

to tell me but never found the right time. I asked who she was.

He got defensive, said it didn't matter because she was in the past. But here's the thing.