As a non INTP dating an INTP, can any of you give me some tips as how to communicate/understand him better?

I'm a female ESTP and he's an INTP. Although we've been dating for almost a year and we're best friends, I find myself not being able to communicate with him at times and this always leads to some sort of fight.

I'd like to better understand his emotional process and thinking process so that we don't have these pointless fights anymore. I've been trying to read about it on the web, but I feel as though advice from INTPs themselves would be better.

EDIT: Thank you for all of the information. I just want to understand his personality type better to improve our relationship. I love him very much and I don't want him to feel misunderstood or unappreciated. So again, thank all of you for your input.