<human>: Provide a brief overview of the text.

Me f (20) him (23). 
Been together for a year, everything has been great with small bumps in the road so far. 

Except for the past two weeks or so he has been a bit distant. I try to ask him questions, but he kept pushing it away. Finally, a few days before my birthday he just all of a sudden text's me saying that he can't handle a relationship that has so much responsibility. 

I don't ask him to call me all the time, i don't over text him. We see each other twice a week at most. The only thing i do that i know he hates is sending him messages about things that concern me about our relationship. I'm sure you are wondering why i just don't tell him face to face. Well he hates that to, he never wants to communicate with me, he tells me he "doesn't want to talk about it." 

I ask him if he wanted to break up, he said no.
Then the VERY day of my birthday he talks about what would happen if he did break up with me (like if i would act crazy etc) I told him that no, i would cut all contact and go on with what i was planning before him. Pretty much ruined my whole birthday. Of course after that he tells me "don't worry nothing is going to happen." 

Before all this he would tell me all these sweet, beautiful things and all of the trust issues i had and everything i was holding back because of a past relationship i let go. I gave the relationship my all, and all my love for him. But now I'm seeing everything he has said before as lies and manipulations.

And now this. I don't know what to do. I guess my question is how to approach talking to him about him flip flopping without him getting mad/upset at me. 
But let me make this clear, i don't want to break up with him, i love him with all my heart.
<bot>: Boyfriend is flip flopping on his stance in the relationship and is messing with my emotions. How do i confront him about it without him getting mad/upset.