Sounds like you have suspicions. Tak with them. Friend had a similar situation. Turned out the person was taking liberties while flying under radar. If they're a colleague they aren't really considered a potential 'danger' let's say. Don't know about guys' experience. I know gurls have major issues because of that.
He confessed he likes me after I confronted him one day coz he told my friends were dating (he assumes I liked him too coz I let him be clingy) hahaha but I thought he's still immature and I told him it's not gonna work.
Legit same situation
Fck. Reminds me of a junior who's clingy af even around my friends that everyone thinks we're dating.