Jealous?

Your mine

It was about 3 in the morning, Jack and Felix were asleep. Jacks phone buzzed and he woke up and had a text from someone with no name. This is what the text said:
Hey Jack, how are you doing with Felix. I want you back. Leave Felix now or I come over. Your mine. Leave his house or I will do what I did to him before, but I will do it on his neck. I love you so let me.
Jack knew who this text was from, the things about what they did to Felix. The cuts on his arms. It was Mark, was he going to come over? What did he mean by your mine? Jack woke Felix up.
Jack: Felix get up Mark might come round!
Felix: What do you mean...Mark can't be here or he will get shoved in fucking prison...
Jack: Read this text then!
Felix read the text, Mark wanted to cut his neck? He wanted to kill him now, Jack was shaking in fear of Mark coming round. Felix hugged him.
Felix: Don't panic, the door is locked he can't get in if he comes round. I will keep a knife next to the bed if your that scared but he won't come round.
Jack: O-ok.. I hope s-so.
Jack went back to sleep and Felix hugged Jack as he slept, he didn't want him panicking and he wouldn't let Mark make him live in fear of Felix being killed any day. They slept for about an hour. There was a knock at the door that made Felix wake up and check the door. Mark was stood outside, his arms had black all up them and his eyes pure white. He had stretchers in his ears and his hair pushed back scruffily. His look made Felix shake. He ran back to the bedroom and grabbed the knife. He opened the door and Mark grabbed Felix as soon as he could. His white eyes looking at Felix as he pushed him into a room and locked the door. Felix was trapped. He could hear Mark walking to his bedroom where Jack was asleep. Felix banged on the door trying to open it but it was locked completely. There wasn't even a lock on the door but it still couldn't be opened. Felix then heard the door opening he listened through the door.
Mark: Jack, let him out.
Jack: Mark...What, who?! Why are you here!
Felix held his tears back, the fear in Jacks usually cheerful voice made him so sad.
Mark: LET HIM OUT.
Mark grabbed Jack and pinned him down, Jack tried to get Mark to release him but Jack was to weak to fight back.
Jack: I don't know w-who you mean....
Mark: You know exactly who I mean Sean.. LET HIM OUT.
Jack gave up trying to get free. He laughed and his eyes went dark green. His ears had holes in them from that looked like they had stretchers in them. His arms also turned black like smoke. His teeth went sharper. Mark let him go.
Mark: I knew you could do it Anti. Let go of Felix.
Jack pushed his hair back and grabbed Mark by the collar.
Jack: That's harder than it seems Dark, you would never understand.
Mark: Anti, your mine now. Felix is gone.

Where am I going with this, idk