Did the sex ruined my relationship , please give me your advice?

i was dating this girl, and we were having a conversation and she said to me if the sex was not that good i would not be intersted in our relationship, i told her what if one day it is no longer that good she said i will ask and try to figure it out with you, i told her for me i will always see you the same no matter what happen, i will see you as the first time i meet you and nothing will change, she said to me i will be a liar if i said the same thing, at the same time she said i have feelings for you and she cares for me, but i do not want our relationship to stand for sex only, i told her if you see it that way then lets make this relationship jsut physical she said no, because of this conversation we endeed the relationship, what do you think guys?

Did the sex ruined my relationship , please give me your advice?
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