HE CONFESSED TOHAVE HAD SEX WITH HIS CHURCH MEMBER

I'm 25yrs old final year student, dating a guy same age.... he's a graduate awaiting NYSC. We've been dating for a year now. About one month ago my boyfriend called me and told me a female church member would be staying in his house for 3days from owerri, because they have a church programme.... ( Dominion city) i accepted due to the trust I had for him. On that sunday he told me to go to church with him but later told me he cant wait, that i should meet him in church which was unusual of him. so i felt it was because of that girl in his house that made him not to wait for me. After all he was inviting me to my church . He said the girl could'nt wait anymore. i felt bad but we later sorted the issue out after 1 week. After our make up, he took me out and confessed he had sex with the girl he allowed to stay in his house ( female church member) I felt bad but i had to let it go & gave him antibiotics to take because he did not use condom with her. After a week he came back & told me that the girl said she was pregnant. i told him to invite the girl over, then i prescribed drugs for her to take after confirming she was pregnant ( I'm an auxiliary nurse before i got admission to study Medilab). but i later thought of it that this guy that i allowed to stay with a girl  & he got her pregnant, worst might happen and my relationship will be at risk. So i told my boyfriend to send her money so she can take care of her self over there... which he reluctantly accepted. On friday, he called me to prescribe the drugs for him $ i told him i wont prescribe until he tells me who want to use it. After much persuation, he told me its for the same girl. I asked if she was around, he said "yes" i got angry because he did nt tell me the would come after what we agreed.... He started shouting at me when i came back, calling me all sort of names that i couldnt trust him. After everytin that night, I went to the chemist and gave him the drugs for her to take. Meanwhile my friend told him to take the girl to the clinic but he bluntly refused. Early in the morning, he came to my house that the girl could'nt stand the pain that she vomited everything. I went to the house, asked the girl some questions  & found out this guy have been lying to me. The girl has been his childhood friend, they became intimate last year. He dis virgined her & she doesn;t even know what birth control is because she is so naive. I told him that if he still want us to continue, he should tell the girl the truth about us, which he bluntly refused. he seems to be taken my meekness for granted. Although he use to be nice & caring in the past. Now it's been almost two weeks he last called, no signs of remorse. I don't know if what i did was wrong or right I;m confussed ...... Mind you the girl in question don't know anything about us ........ i need advice pls.