Engaged and Curious

I’m an engaged first-year law student and last night I had my first sexual encounter outside the relationship. It was with a stranger at a bar who whispered, 'Let’s get out of here,' and took me to his place. We fucked hard against the wall, both desperate for release. He then pushed me down and buried himself deep inside me while I gasped for air. Is this just lust or should I be worried it means more? What do you think?