idk what to do help me

Nicole • I'm 17
So me and my ex broke up either in January or February. And I was talking to someone. When me and my ex broke up I was very hurt but me and the guy I was talking to. Clicked we had so much in common. We're dating 3 months now 
Me and my ex 2 years.
Deep down I miss my ex my heart breaks when I see him or here him. I should be over him after he hurt me multiple times. 
And I love my current bf so much. He's made me much happier. But deep down I kinda miss my ex. And my bf he's notice I've change the 2 month my attitude is bad. And we argue a lot now. 
What do I do plz help me. I'm scared and I actually don't wanna lose u bf I love him to death. We talk about marriage kids our feature and I wanna stay like that.
Advice or ideas plz help I'm in need of it

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