relationship problem! it's serious!

So me and my boyfriend have been dating for almost two years! recently, i've fallen out of love with him, well for like the past two months. When we hug or kiss, i don't feel anything. i'm not attracted to him anymore. i believe i still love him, just not as a future husband. We had everything planned out on getting engaged and married, but i can't even imagine marrying him now. Like sometimes i can't imagine my life with him, but i can't imagine him not in it. i hate to put it this way, but it's like i'm bored. 

I'd never cheat, but i've found myself liking another guy. it's nothing serious, and i wouldn't let it be since i'm with my bf currently. This new guy is kind of the guy of my dreams, knowing what i know about him. my boyfriend, however, i would have never put myself with him. we don't share any common interests. i love rodeos! i want to live on a farm and everything. my boyfriend has made it clear in the past that he's not interested in that. this new guy, is a bull rider and already lives the farm life. recently, my boyfriend took a sudden interest in farms and stuff. The main problem is, my boyfriend is literally perfect to me. he spoils me and loves me so much. he has helped me tremendously throughout my past years with him. he loves me unconditionally and i ant break his heart. i just don't feel it's right anymore. that is the only reason i could break up with him. please help me. it has stressed me out so much. my friend told me i was "emotional cheating." that kinda broke me and i admit that's what i'm doing. i just can't break his heart. i told him that i don't think it's right and all and it broke him but i couldn't make myself break up with him. help.