Why does it seem like in similar cases conditional learning or habituation happens?

So I’d like you to explain to me where I’m going wrong and how these two types of cases are different?

So in classic conditioning like with Pavlov’s dogs, if we ring a bell right before we bring food to the dogs where they would normally start to dribble, now if the dogs just hear the bell it will make them dribble. On a cellular level when two cells fire at a similar time, in the future when one fires it will set off the second one.

But in habituation the opposite seems to happen, so in our head we have the connection fattening foods taste good, but if we had burgers everyday rather than strengthening that connection it dies out, where am I going wrong here?