How easy is taking that decision (now)?
Generations of Pakistan have have grown up looking at Israel as an occupying oppressor, killer and murderer of Muslim children. You are fighting with the worst kind of terrorists, can you afford .... giving them another reason to fool your people? Plus you have significant Shiite population who love and hold Iran as some holy land .......
People of Israel don't like Muslims (its not some rocket science to understand that) ...... they believe in some serious sh*t that tells them that they will rule the people again, even if it means killing and removing non chosen ones at large scale ...... they have a purpose and ideology behind their separate land ........... and that ideology clashes with Islam and Muslims. Israel isn't in love with India because they two were some centuries old friends (just read what Judaism thinks of Idol worshipers) ....... it means something ..... somewhere their interests are common.