Car was repossessed with you sitting in it and it was in your backyard and cops were called by repo man to make you get out of the car is that considered breach of peace?

YES! reposession is a civil matter, reposession men have been sued over cases like this and lost. He should have approched you and stated he's there to repo the car because your behind on payments and if you declined, he should have left and came back later to get the car.