Boyfriend text other girl (long but help)

I'll try to make it short. My BF and I have been together for 3 years. It's like he has a problem with me texting guys but it's ok for him to text girls and when I get mad..'I'm tripping. I don't think it's any girls to worry about but he is constantly texting them all day everyday. Like this one bitch(sorry but she's rude) he swears they don't text all day everyday but when I see him she's always in his damn phone and every morning she's always in his damn phone, he even txt her good morning and I don't even get that shit. Yes, he gives me reasons to have trust issues because he lied to me about smoking week and even GOING OVER A GIRLS HOUSE to smoke it cause he didn't want to buy his own. But then he says " what's wrong with having girl friends and shit like no this on a new level. He always says " I don't want her she's 15(he's 17, I just turned 18) but like I said this just pisses me off and I'm sure he ignores my shit and text them back. It's like when we hit a rough patch this bitch just pops up and it's OK for him to text her but when I wan to talk to someone it's "they just want to have sex with you" like damn, ok maybe I want to have sex with them asshole( not really lol) He won't take pics with me, he has pics of his friends and not me, he deleted them, won't even put me on snapchat, it turns into a argument. I told him he can live the single life and now he's all salty.