Short story, let's go!

So I've been really good friends with this guy for almost a year and a half now. We dated for a few months, but broke up because I went home for the summer break. He lives in Texas and I'm from California. I come back and move into an apartment with 3 friends: 2 guys and a girl. I don't get along very well with girls, and I knew this girl had a reputation for, pardon the language, being an "easy f**k".

The guy came over to my place a few times and he met the girl. They became friends, but she had promised not to pursue him because he and I had been talking about getting back together. His brother and sister-in-law were really hoping for us to get back together; they loved us as a couple, and they love me.

The girl eventually got kicked out of the apartment for not paying her rent and now spends a lot of her time with this guy. I had asked the guy a few times if they were dating as well as his brother that I'm good friends with as well. He said no.

Then, today, I found out via text that my ex-roommate is pregnant. I hadn't heard from her in over a month, and this guy hadn't messaged me in almost 2 weeks. I didn't know they were dating cause last I asked, he said they weren't!!

Now, I have serious trust issues thanks to being abused verbally and mentally as a child. This guy was one of maybe 3 people in Texas, where I go to school, that I trusted. I feel betrayed and crushed. He knows I still love him. He knew that I can't stand this girl.

I don't know what to do. On one hand, I'm glad to know that I don't have to worry about what to do in regards to him. On the other, I feel crushed that he chose the easy fuck over his best friend.

What do? I've already deleted them both from my phone and facebook... and refuse to go visit them. I want to be supportive of them; raising a baby is gonna be hard, and the guy has always wanted to be a dad... but at the same time, I need to take care of myself. Years of therapy and trust building are falling apart.

What do?!