im bisexual & im dating a girl . i dont know what to do i want to make her a special letter to s

We broke up just lkke two days ago but got back together im inlove with her well that's what i think & feel & i need help . i want her to know shes my everything my one & only the only one i adore . she means alot to me . so how can i write a letter expressing my feelings for her .. Please help!!!