If you love her, show her you do.
Nothing is better than showing a girl your love towards her. Sure, a simple “I love you” can make her smile, but if you put in effort and show her you do instead of just saying it, it’d mean so much more to her. Remember every little thing you do for her counts, even if it’s small and simple. Do anything that will give her butterflies in her stomach, make her feel special, and show her she’s only the one you want. Treat her like there’s no tomorrow. By showing her how much you love her, you, basically, are giving her a reason to stay with you. No girl would leave her boyfriend when he has treated her so well and made her happier than anyone else could. Always remember, actions speak louder than words.