Big expensive gifts are not the answer.
try small things that spark a memory of you being together.
hold her hand,
ask all about her day, you dont have to say much, but she will appreciate you listening.
surprise her with a flower.
send her a random txt message saying how much she means to you.
kiss her when she is least expecting it.
fix her fringe so you can see her face better (even if she doesnt have one!),
tell her she smells good if she has perfume on or hair syrum.
come up behind her and hug her for no reason.
when you meet up with her make sure you try to be in a good mood and smile.
give her a cheeky pinch on her leg or bum when no one is looking.
take her out for a picnic but dont tell her where you are going.
take her to her fave store and tell her she can have anything she wants as a treat.
organise a romantic meal, cooked by you
tell her a joke (nothing rude) perhaps a little pathetic, every so often
send her a bunch of flowers to be delivered to her school/workplace
do something new together, eg swimming, going for a run
before you kiss run your fingers through her hair
tell her something she never knew aout you, like a strange habbit
tickle her when she least expects it
act silly for a day. make a pact to do something silly for the whole day to see who can last the longest
wear an odd tshirt just to make her laugh
i hope there is enough for you!!