unhappy relationship

I am in a relationship for 8 years now. I love him but I don’t know if it’s mutual or not. Everything was going fine until last year when he started ignoring me. He would not answer my phone calls or tried avoiding meeting me. Whenever I would ask him about his changed attitude he would just shut me up or threaten me to break up. I cannot leave him because I know survival without him would be impossible and by this, I am not kidding because I am totally dependent on him. I have grown up with him, our parents know about us and in fact, we were planning to marry next year. Please tell me what should I be doing in this situation.

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