should i get over him?

[Olivia]

I have liked this boy for a while now, i dont see him that often but he is always in my head, ive tried to get over him but my friend (his cousin) says i shouldnt and that i should just wait. but it is really hurting, he has a girlfriend at the moment, and i feel like i am just waiting or them to break up, i dont know if he knows i like him or not.... so what should i do? i have noticed other people but he is always on top of the list, he is always on my mind so my feelings for the others are not strong, if you know what i mean.

helppp!!!!
heres some more information
I met this boy through my friend poppy, he is a relative of hers. I have always really liked him we joke around, but don't speak that often because we hardly see each other. he has a girlfriend, and he is a year older than me. my friend poppy knows that i like him and doesnt mind that i do. my friend told his younger sister that i like him and she told him. one day my friend texted me saying that he knew and told all of her family?!?! could that mean anything?

then a few months later i was at my friend poppys party and he was there. we talked and stuff, it was great, all of his family was there and me, no one mentioned anything tho. when the fireworks were being let off he stood right behind me (really close) i felt really safe. when i was sitting on the floor playing with my friends baby niece and he came over and was playing with her too. when he left, my friend poppy, told me that he was acting really different when i was around. a few weeks later i followed him on twitter and he followed back, and when he went round my friends house he mentioned that i did, and started talking about me to my best friend and to her family. he asked how old i was and when my birthday was, when my friend poppy told him he was shocked and happy, but said that i am older than his girlfirend, then he said that he didnt actually know that i fancied him?!? then he said that he doesnt like blondes (i have blond hair) but his gf has blonde hair????? my friend asked who is taller me or his gf and he said olivia (me), she has longer legs.

[Dallers]

Even in a relationship men love to flirt and know that other girls like them it gives them power and self esteem. But as soon as they are out of the relationship they hit the floor and realise it means nothing.

Even if he did like you it would be impossible to tell because he may just be keeping you there to feed his ego. If he knows you like him he has the power and so you are left to either chase or walk away.

If you chase expect the worst possible outcome, you are best to look elsewhere and find someone new and walk away and then sometime down the line he will break up with his girlfriend and you may not even be interested or then would be your chance.