In addition to the Love Your Girlfriend article - this article will be helpful for girls on how to love their boyfriend.

[edit] Steps

Tell him that you love him everyday and at random times.
Intertwine your fingers with his when you walk together.
Cuddle up to him when you're sat next to each other.
Be happy when you are around him. If you are having a bad day, let him know. He's there for you.
Spend time with your friends and never compromise when he is sad. You don't have your full time with him.
Hug him from behind sometimes as a surprise.
Share some inside jokes with each other - there's something very bonding about having a cute little secret only the two of you know.
Cheer him up when he's down. Anything from a joke to a sweet note left where he could see it.
Bake or make things for him. It's a really sweet gesture and he's sure to appreciate it.
Try not to be bitter or jealous. Be humble, sweet, adorable and extra flirty.
Be honest. When he asks you if you're okay, don't tell him you're fine if you're not.
Compliment him on how he looks, what he's wearing, etc.
Hug/kiss him first sometimes. Don't let him be the one always doing it first.
Lean on his chest when he is lying down. Most guys like that and he won't stop you.
Show your love to him whenever you can.