Should i cheat on my boyfriend? (advice please)?

Ive been with him since we were 16 (were 19 now) hes the only person ive ever slept with we have been together for some time and the is getting boring i told him this and he hasnt done anything about it. So anyway i met this rich guy whos about 5 years older than me but goodlooking weve been "ting" and he wants us to meet up so we can have , hes really nice.My boyfriend lives somewhere else so if i was to do something he wouldnt know but im worried that i dont know the guy and he might be some weird serial killer so thats why im having doubts, otherwise i think i would have sleot with him, what do you think?