It wasn’t that the west stopped celebrating Easter after Passover. It is that we moved to a far more accurate calendar, that places the equinox back to the date it occupied at the time of Christ, which is to say that the Church sets the date of Passover, and doesn’t care when modern Jews celebrate it. In this sense, we still celebrate after Passover, because Easter must always fall at least one day after the Paschal moon. Should the Paschal moon fall on a Sunday, as I believe it did this year, Easter is pushed to the following Sunday. Most often, Passover still falls during Western Holy Week.