You Think you know about relationships come solve this

Alexis and Peter are very close friends for years.
Peter has a girlfriend whose name is Blessing.

Alexis stays in a strictly residential Environment, where the street is dominated by buildings and shops without Bush or hidden corner

One day, Alexis  was sitting down on his bed in his
one room self contain and he was putting on only
his boxers. Blessing came knocking five minutes
later and Alexis opened the door for her to come
in.
" How are you?, where are you coming from?"
Alexis asked his friend's girlfriend as he was
surprised to see her unannounced. "I came to a shop 5 buildings away from here to deliver a message to my Dad laundry Man and I'm already going home but seriously pressed.  since I couldn't find a bicycle to take me home I had to stop in
your house to use your toilet please " Bola replied.
before Alexis could finish saying yes you can, Blessing had rushed
into the toilet, locked herself up and she was
easing herself.
Alexis sat down on his bed and continued to surf
his phone until about a minute later when he
heard a knock on his door. before he could get
up to open the door, the door was opened and
his friend Peter entered into the room.
" guy how far?, just bored at home and i decided
to come over" they exchanged greetings and
before any one of them could utter a word
further, Peter saw his girlfriend's bag on Alexis'
Bed he he was shocked. he looked at Alexis  and
he realised that Alexis had only boxers on him. he
got his greatest shock when his girlfriend Blessing
was coming out of Alexis' bathroom and she was
Adjusting and zipping her trouser.
Peter walked out immediately and he wants to
break up with Blessing on the grounds of cheating
with his friend.

* was Alexis at fault?
* was Blessing faulty to stop over at Alexis' house to
use his restroom when she was pressed?
* was Peter at fault for breaking up with his girl
based on what he saw?.
*how do you think the whole issue can be
resolved.?
If you are find yourself in this situation what will you do.. Please drop your comments below....