Am I being ridiculous?

Katie • Volunteer Firefighter, EMT, drag racer
My boyfriend was telling me yesterday that there's a new girl that just started working where he works. He was telling me that she relentlessly is trying to flirt with him. Their uniforms have pockets for pens and stuff and she walks up and takes the pen out of his pocket and then puts it back. As he was telling me this, i got insanely jealous. I wanted to rip her eyes out lol. I trust him I just don't trust her. If she does it again, should I say something to her or am I just being paranoid? ??