There are bases for mistrust. Our Iranian brothers have history with India after revolution, when Pakistan helped Iran against Iraq and provided Nuclear and Ballistic tech to Iran, Iran sided with India in 90s on Afghan civil war by supporting Northern alliance terrorists, They allowed India to use their port for dealing with current hostile Afghan regime, we capture their operatives who confessed to operate from Chabahar, Iranian interference in Pakistan is not hidden from anyone either, they recruited thousands of Pakistanis for terrorism in Iraq, Syria and Bahrain. Foreign Ministry of Pakistan recently claimed there are training camps of Baluch zionists on Iranian soil who are targeting Pakistan.