Is he worth the risk?

I've been with my boyfriend for three and a half years now, and for the last six months i've become a little dissatisfied with how things are between us. not that i don't love him, i do, it's just the monotony of being with the same person for so long is beginning to drag. Also there's a Polish chap i have a bit of a thing for and last saturday, after we were out at a friends leaving do (my boyfriend was there too), we were texting till 5am while my boyf snored away. i've found out that the polish guy fancies me as much as i do him. the sparks always been there, and basically, with my feeling bored and him in my head, i want to, you know, wander. but my morals wont let me. help??