Pregnant & Single-just kicked boyfriend out!

My boyfriend tried to sleep with my nasty roommate, who of which is not innocent at all in this situation. She had been flirty with him, vulgar (sexual references) permiscous behaviors etc... long story short, all this BS happened while I was in recovery from a surgical procedure and pregnant, and still pregnant. I threw him out, I can't throw her out because the low life is on the lease. Now I don't know what to... have the baby and be a single mom or have an abortion?  She just had an abortion and made my pregnancy about her, she wanted to ruin my relationship and I know she wants me to have an abortion because her BF didn't want her baby...  My roommate also had DADDY issues big time and is very explicit about her sex drive etc.... this was also my best friend of 13 years! I just don't know...😢