When writing Instagram captions for girlfriends, especially on couples' selfies, using love quotes, sweet lines from songs or romantic sayings will make her smile.

Love is what makes you smile when you're tired.

If you can't stop thinking about your man, it's the perfect time to tell him how you feel by sending him cute boyfriend quotes! We found the best ways to say 'I love you' and let him know he's on your mind.

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