I feel like a lot of people are dragging OP in the comments, and while I understand why this topic is sensitive to a lot of people, I think we should remember that this person came here to ask for advice, not to make a statement.

Now, OP, have you thought that maybe your gf wants to dress that way so she can look good for you? She asked YOU to pick the outfit out that YOU liked, right?

Yes, other guys will see her. If she cared about other guys, she probably wouldn’t be dating you. They’re probably on her mind about as much as other girls are on yours, which is to say, not at all.

Stay in a relationship long enough and guys will hit on your girlfriend no matter what she wears. This is just a reality of being a woman who goes outside. As someone who’s had loyal and who’s been cheated on, how she handles that isn’t something you can control. But 99% of girls aren’t going to leave you for some drunk guy at a party who loudly yells at them that they have nice tits. And hey, if she’s in the 1% that does, then she was never the one to begin with. I hope this helps.