Do you know why your girl gets all jealous or upset when it comes to you and other women? 

It's because she might believe that you're bored of her and found someone else more interesting, she might be afraid you might lose feelings for her and gain feelings for another girl as you guys text, talk and hang out, she might notice that a lot of girls do like you and if you wanted to, you could have them because you're such a great guy. She wouldn't blame other girls for wanting you, cause she did and still does want you and because she actually has you, she isn't trying to lose you, especially to some other bitch.