I need help please boy and girls!!!?

i know this might seem funny ha ha but i need help ok well how do i get over a break up i was so in love,did everything i could and now its over and i can handle it i feel like my hearth just literally broke in two peaces im not my self any more and this pain in my chest hurts and every time i see him or her his names all the felling and pain is back wen im with other guys i still want him back please how do i get over him tips please im tired of crying my self to sleep and dying of pain wen i se him with another girl! <3