AITA? Girlfriend saw I got a romance achievement

Playing AC Odyssey after watching Nolan's The Odyssey. Really liking it.

Romanced a character (oh my god it was so cheesy) because I saw there was an achievement for it. My gf saw the achievement in her steam activity feed and wants to talk.

Is this a common boundary people make or cross? Its not like im actually interested in this random NPC or gooning to a dating sim