It isn't that he pushes everyone out. He just does what he loves, be who he wants to be. It's the other people that lose interest in him. If he becomes antisocial, he would have pushed the gal away too.
Remilia: I am the villainess! I do things solely to revenge my bff Emi who was wronged! Soon, I will unleash my super duper evil plan to get back at my enemy!
Also Remilia: Save the entire demon dimension from destruction, better the life of demons in the human's world, try to change the...