Confession bear/depression bear

Today, my heart broke. The love of my life hung out with another girl, knowingly behind my back while I was working the graveyard shift. This had been planned for weeks and I've known they've been friends for years, and even have asked to meet her before. But instead of inviting me to have dinner and meet her, he instead goes out to dinner with her and she came over to our house after for drinks and video games.
When I came home that next morning, I saw a little bit of a mess by the video games and some beer that was bought. I asked him "oh did your guy friend (let's call him Chase) come over?" "Yeah he came by for a little bit last night". So I thought nothing of it. But something, deep down inside of me told me to do something I usually never EVER would do. I went through his phone. He had recently switched phones and left his old one on the night stand. I was watching TV and just thought I should look. I don't know what made me look. I don't. Call it woman's intuition... well now call it total and complete heart break.
Texts going back a few months... I couldn't go past the pictures she sent him wearing only a bikini. Her saying "I know I shouldn't send you these because they are sexy hehe". And he just accepts them. Didn't stop her.
The one that truly broke my heart was them "joking" about if she lived here, that he would be going after her. He said "well maybe if you lived here I would". Ouch. The day that they hung out, he texted her as soon as he walked out the door from kissing me goodbye. I believe he even asked if I worked that night.
When I asked him about it all, he said nothing happened and they joke around with stuff like that "all the time" and I wasn't meant to see that or hurt me. But fuck it did hurt. I haven't cried this much since I lost my uncle to cancer.
I told him she's a home wrecker for sending him bikini pictures knowing we're together, and he just defended her down to the last word. He said he would be more careful about how he talks to her... but I don't know. There's not a single person besides my boyfriend that I would ever say those things to or send bikini pics to. (They also joked about having kids and being in a polygamist relationship with me) And he lied! Straight to my face about having her over the house. He said he didn't want things to be "awkward" if we had met because he thought I didn't like her. What if someone saw them out together? What the fuck would he have done then?!?
I'm just so completely heart broken right now. I wanted to start a family with him. I tell this man EVERYTHING that happens in my life. And I couldn't meet his good friend that he's had for years??? He picks one of the three nights I work all night to meet up with her and have dinner?!
And he didn't even try to fix things. He was almost angry. Yeah I was a little bit of a bitch to go thru your phone but hey buddy YOURE wrong here, not me.
I don't know what the fuck to do. I don't know what the fuck to say. I want to run away. I want to get this numbness out of my body. I just can't deal with this right now. I needed to vent. I want to work things out but the trust is gone. I can't look at him without wanting to cry. I would never do this to you. How could you do this to me?