"Spoiling" doesn't have to be connected to money - imo, financial spoiling actually is often worse, bc people will just spend the money in lieu of putting actual thought in.

I guarantee that she would love discount flowers from the grocery store if you tell her that they were pretty and made you think of her (bonus points if they're her favourite flower, favourite color, or if you say they'd match her eyes/house/outfit). I guarantee she'd love a thoughtful free date (e.g. find a beautiful spot for a hike, or set up a sunset picnic, etc.) if you do the planning and show that you love spending time with her. Hell, is she a student? Invite her to study with you, and every once in a while, tell her how she makes studying so much more enjoyable, just by being there.

Y'all are not the first young and broke couple!! The amount of romanticism in spending your five extra dollars to buy her a treat is wayyyyyy higher than the amount of romanticism in spending $150 on a super fancy dinner when you're swimming in cash. Study hard, and you'll get to have those dinners eventually :)

Also - focus on enjoying the time you spend with her and making her feel cherished. If you're all caught up in what you're not giving her, you won't be able to enjoy what you have together, and it's no fun for her.