My gf doesn't want me to touch her..an im not talking n a sexual way either im talkin period...what do i do?

we been together for 2years now its been a great relationship i mean we put off sex wen we first started goin out then wen we finally had sex we had it alot i mean **** sumtimes more than 3 times a day but recently we moved in together n sex stop drastically like mayb once a week to like once a month to like not at all i have talked to her over n over like whats wrong r u not feeling me anymore do u wanna break up and i always get the same answer she says i wanna stay with u n i love u but it jus confuses me den y do u not allow me to touch u all of a sudden or y did the sex stop or y r u so distant. i need help i need answers i love this girl to death but its like im puttin my all into nothin