Why won't my husband stop talking to other females in very inappropriate ways that's not ok when your married?

I've been with my husband for going on 3 years now and married for the last year. We've struggled a lot with trust and so i end up going through his phone and seeing so many different messages to so many different females and when I go and read them he is talking in ways he should not be ever if he was really committed to this marriage and really wanted only me his wife then the things he is saying to other chic's is down right degrading and very offensive and even more then anything that sh*t hurts!!! When I start letting it get to me so bad it causes us to fight so i tell him about what I seen and then he goes into a rage saying I'm a nosey bit*h and he uses the excuse of he does all that and says all that on purpose to catch me in his phone to see if I am still going through his stuff and then promises me he won't ever say those kinds of things again to any female except for me but yet here I am asking this question of WHY cause he won't stop and I don't know how much more I can take!!! PLEASE HELP!!!
Why won't my husband stop talking to other females in very inappropriate ways that's not ok when your married?
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