Eyes for someone else

Im third year into my long distance relationship and im thinking about another guy. This is my first relationship and i feel so curious about guy no2. He has been friendly in past but no proof to show he likes me and i cant make a move because that would be cheating. The appeal of guy number 1 is that we've had 3 happy years together he's a good guy. Adores me, loving, has a great career and is loyal. Guy no2 is taller, funnier and there is my curiosity!!! I feel this curiosity burning in my heart, but i dont want to hurt man no1. I mentioned to him that i want a break cos i feel attracted to other guys... but he only has interest in me. Is it normal to feel tired in ure relationship after 3 years and find other guys more attractive than your boyfriend??