YOU SAID:

i went over to my boyfriends house and pet his head

INTO JAPANESE

私は彼氏の家に行って、彼の頭をかわいがった

BACK INTO ENGLISH

I went to my boyfriend's house and loved his head.

INTO JAPANESE

私は彼氏の家に行き、彼の頭が大好きでした。

BACK INTO ENGLISH

I went to my boyfriend's house and loved his head.