My boyfriend pins me down when he's angry, what to do?

My boyfriend is a really nice guy - polite, kind, caring, liked by everyone - but lately he's been a bit rough with me.

I don't know if it's because he feels more comfortable with me now that we've been going out for about 2 years but all of a sudden he seems to think it's OK to pin me down when he gets angry and shout in my face... he holds my arms really tight and it really hurts plus he looks so angry it's a bit scary... and it's not even a fight about something major.

I need some advice, how do I get him to go back to how he was in the early stages of our relationship?
My boyfriend pins me down when he's angry, what to do?
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