Friend Problem!?

I am a guy and i told my friend who is a guy that i liked this girl in our cl. The next day he started to REALLY flirt with her and it really iratates me and when ever i see him with her it eats me on the inside. Is this Envy because if it is it suck and burns soooo much an i dont know if it is jealousy because i usually dont get jealous but how i fell is every time i see him with her and there flirting it kills me with this strange felling of frustrasion and anger towards him that i just want to kill him because he has suck success over women and i dont. Is this jealousy?