I Am 20 And I Have A Girlfriend DAT I

I am 20 and I have a girlfriend DAT I love dearly but I leave her break other women hearts then get bored with then run back to my girl then get upset when I see the other girl I hurt talk to other people or try to get over me so I get crazy like why is it like that then its not only one girl its more then one I don't want them talkin to other people but I got a girlfriend what's wrong with me