I paid my house rent in my boyfriend's name, now he has refused to leave my house with his 2 children

From a female lindaikeji blog reader
I am in a really big mess at the moment
and I feel stupid. I moved to Ghana for
studies in March and met this handsome
Ghanaian who I really liked and fell in love
with. He said he just came back from
South Africa for some charity work he was
supposedly doing with the UN. Few weeks
to meeting him, I decided to get a place of
my own since I didn't want to stay in the
hostel anymore and so we went in search
of a place which I got. I loved the
apartment and was willing to pay for it but
the Ghanaian Landlady told us pointblank
she does not give her house out to
Nigerians.
In order for us not to lose the place since I
liked it and I am a Nigerian, the Ghanaian
idiot who said he loved me, asked that we
pay the house rent in his name.I stupidly
agreed and moved in the next day. He
moved in also with me. Three days later,
the idiot showed up with a set of twins,
saying they were his children. I was
surprised but I welcomed them and
entertained them. They stayed in my
apartment for a week, destroying stuffs and
eating my food. When I got fed up, I asked
their father when is he taking them back to
where he brought them from. To my
uttermost shock, he replied me saying he
does not have a place to take them to as
"this is their father's house". I said "huh"
and he goes "Yes, their father's name is on
the tenancy agreement". I was shocked
beyond words. The thing has even made me
sick because he has refused to leave my
house despite the fact that I have
threatened him with police. Sad thing is
that he has the tenancy agreement with
him and has refused to release them to me.
My rent is due in September 2016. Do I
walk out on him leaving my house for him?
I am confused on what to do.