[Please Help & Read] Trust Issues

My boyfriend have been dating for 3 years almost and trust issues have come up. Mainly when he lied about going over a girls house because he was smoking weed and he knew I would disapprove of the weed. Although I DISAGREE over going to that bitch house, nows she's PREGNANT. Not his though, I'm just stating, she got drunk at a party(Lordt) but she still text him, and saying "you don't care about me" and I never saw him text her back. He's also friends with this girl off snapchat, he's never met her but she lives in our city. I've read their convos and it's nothing but basketball and sports, which is something I don't know anything about but he's finding that in HER! and then then there's this girl he's known in 7th grade and when we had this big fight it's like this dusty ass girl dropped out of the sky, LITERALLY, but my thing is he will text these girls all day or either say he doesn't text them everyday. And then when I say something about it he wil say what's he point of having a phone but OH HELL NO, let me get to the last point. We are Seniors in high school, been dating since freshman year. So this BITCH ASS GIRL, is at her cousins house(which is his friends house) and gone say call your friend to come over, he called him. It he didn't answer. His friend told him that he's probably WITH HIS GIRL. So she tells him to text their other friend and their other friend text him and he was basically like no, BUT THIS MOTHERFUCKING BITCH text his phone. He swears he said said "no and he's had a girlfriend " I just really don't know. I don't know, the whole having girls as friends is bothering me and this bitch ass girl is bothering me too like BITCH IF YOUR TOLD HE HAS A GF WHY TF IS YOUR ASS BARKING?! She gone bark at the wrong mf tree and I'm gone beat her ass down... Nvm, tase her. I CANT STAND BITCHES LIKE THIS. Oh but then my friend told me a few weeks ago, this hoe (the girl who wanted him to come over) walks up to them and acts like she's talking to the group, he doesn't say nothing to her, and then says "Hey______, you not gone speak?" And he was like..."uh what's up" and she was like "I know I see me " and he was just like "I saw you walk up here??????".