How do I handle my boyfriend's brother trying to sabotage our relationship?

Anonymous
Myself, my boyfriend and his brother used to live together. My boyfriend's brother and I got along well until I discovered that he was secretly going through my personal things. I didn't like that so I moved out.
When my boyfriend and I first started dating, his brother used to tag along with us and when we were all living together he wanted to socialize with us all the time. He is 25 years old, never had a girlfriend and has no friends, he only socializes with myself and his brother.

I want to live with my boyfriend again but his brother refuses to move out, he insists on staying with his brother. He (my boyfriend's brother) now has TB and even refuses to go visit his mom and sister for the weekend so that myself and me and my boyfriend's child can go visit by my boyfriend. I am also expecting our second child.

I feel like it is very spiteful of my boyfriend's brother to refuse to go away for the weekend to prevent our child and myself with the unborn baby to get TB from him. Also, if this is his attitude now, how will he handle it when my boyfriend and I want to find a place of our own without him?

I do not understand his behavior. Why is he so determined to come between myself and his brother?
How do I handle my boyfriend's brother trying to sabotage our relationship?
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