Am I taking this too far?

I’m on holiday with my boyfriend of nearly 2 years and I am literally watching him checking other girls out, I asked him and he said out right no and that he wouldn’t. So I left it.

Another day caught him again (not the same girl) and he said no again. So I thought ok maybe it’s just me being paranoid.

Today it happened again at breakfast, if he didn’t look once he looked ten times in front of my face! And he wasn’t just looking at her face.

This time I thought I’d have it out with him because it was starting to make me feel a bit crap. He said “This time I didn’t” and admitted that he was checking a girls bum out a few days ago. Obviously I’m upset and I find it disrespectful that he is literally doing it infront of me, am I taking this too far? Or am I right to feel like this?

Baring in mind this is our FIRST holiday abroad together.

Thanks xxx