Student Dating Teacher?

I was on a holiday with my friends three months ago and one night we were out in a club and we met a few guys thinking nothing of it i got really close to one of them and we kind of just stuck together for the rest of the holiday we had a great time and i really liked him, we never actually asked each others ages? he looked about 21-23 and i am 17 going 18 this year. He was gorgeous with the most amazing smile and biggest brown eyes. After we came home we went out a few times too. We had holiday pictures on facebook and stuff and texted quite often. We stopped talking for about 2 weeks and then on a normal monday morning shockingly i seen him walking into a clroom in my school! i thought i was seeing things but it was true He was the new teacher in my school! When he saw me he was just as shocked as i was. He texted me during lunch and said we needed to talk asap. i went to his cl and he said we had to pretend we didn't know each other so we did for weeks and i deleted every picture on facebook and stuff. but in the hallway he seen me kiss one of my guy friends on the lips (just a little friend kiss nothing else) but he saw it differently and he then asked to see me in his cl were he said that he couldn't bare to see me with anyone else and kissed me. We were then texting and he said he wants to start a relationship with me, i really want to aswel, but i'm wondering if i move school or if i switch cles can that happen? or if we kept it as quiet as possible. He said age doesn't matter to him as we found out there is only nearly 5 years age gap.