Not mom related but need help.

Have any of y'all ladies ever developed a crush on someone while in a relationship? I've been with my boyfriend for 6 years. I'm 20 years old. There's this guy at work that gives me butterflies. He calls me beautiful every time I walk into the room. My boyfriend isn't the lovey dovey type so its kinda nice to be treated this way. I feel so guilty..I'd never act on anything because I absolutely love my boyfriend. Its just hard because I got with him at the age of 14 and never got to experience different relationships or anything. Any advice?