relationship advice?

okay soooo... ive always been a very flirtly playful girl while single. when im in a relationship im commited and dont flirt around but i tend to get bored very quickly with my SO. is it possible we get comfortable to quick & theres nothing new to learn? i dont know what im doing wrong but My current BF & i been together almost a year now and i have the hardest time getting WET & ready for sex.. like im just not turned on and bored? its not even just about sex either, i just loose intrest in eberything.. we went from every second together to trying to find a way to be apart.. what the hell is wrong with me?? is this normal??