i need advice!

my husband and I have been together for 4 years married three. when we first met we we're inseparable. he got drunk the first time I took him to meet my family and my mom wasn't impressed. he got plastered the night we got married. he is a totally different person when hes drunk. he plays on his phone talks to his ex wife and another female friend of his that likes to send him pics of herself in lingerie! bent over in the mirror with her ass hanging out of her shorts sending collages of here lady parts to him and he doesn't say I'm married don't send me that stuff, just says I know you're sexy. he said I should just deal with it but it hurts. yea I go through his phone because I've caught him talking to these girls while sitting beside him. I was never insecure before I married him. my mom says that I deserve better because if he loved me he wouldn't be doing things like that. what should I do I'm ready to move on with my life and be Happy again!