Relationship advice plz!!

So I'm 15 and have been with my bf for four months, but we talked for a verryyy long time before actually dating. I lost my virginity to him, and I love him as a person, but I just don't feel it anymore. I used to have a thing for him, yes, but I'm not sure if I ever loved him. He tells he he loves me all the time and gets upset when I don't say it back and is kind of emotionally abusive. 
   I don't know if I should end it with him or not, there are so many other factors involved. Like I know that if I do I will be relentlessly called a user and a slag, and he has become close with my best friend who will continue talking to him even if we do break up. I'm just struggling to find myself happy with him anymore and I need help. 
Opinions? And sorry that was a bit long :/

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