The main thing that you have to realize when you wonder why your boyfriend is looking at other girls is that it has nothing to do with you. Men look at women period, it's perfectly natural. All men, especially young men have a lot of testosterone pumping through our veins and that makes us instinctively want to seek out mates. Men from the time that we discover that we like women until probably the day we die are always noticing and evaluating pretty much every woman we come across, even if we don't find them particularly attractive.
This has no bearing whatsoever on whether your boyfriend might be happy in your relationship or if he might find the girl across the room more attractive then you. Nor is it an indication that he might be cheating or wanting to cheat. It's like if I had a great car that I loved and would never part with, I would still notice other cars on the road. Some might even have nicer tires or a sexy paint job but I have a special bond with my car and I am not about to just trade it in because a flashy convertible catches my eye.
Now looking at other girls is a problem though if he is being creepy or obvious about it or doing it in front of you. Then it is disrespectful and you should say something. Don't demand that he stop looking at other girls. It's completely unreasonable to expect that he really will, even if analytically he agrees that he shouldn't want to. He might tell you that he will but he will mostly likely be lying to make you happy and he might start seeing you as insecure and resent you for trying to control him. What you can do though is ask him to not check out other girls in front of you. Doing so front of you is disrespectful and he should at the very least be able to not do it while he is with you. If you are young this might be difficult because during their teens men have a lot more testosterone in them.
Just be cool about it and remind him nicely if you catch him slipping. There is nothing more attractive to a guy then a girl who is laid back and secure.
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