There is a runner dynamic in twin flame relationships. Those who have experienced a twin flame relationship- know this dynamic well. There is a constant push and pull and it can feel like every time you take a step forward, you're pushed two steps back. It can feel very intense and painful when you aren't the runner. Here's what I have found that has helped me handle the runner dynamic.
Fear of Rejection:
He may run because he doesn't feel worthy of the connection and fears that once they let you in fully, you'll leave and they'll be rejected by you. He's really running from himself. They are insecure you will reject parts of him he hates about himself. They are petrified of you rejecting him because he will take that as confirmation/proof of his own belief that he is not good enough. He knows the connection is deep. Connection is a gift. They run because they believe ultimately the love will be taken away. Lack of self esteem and self love, and a fear of not belonging is strong in this dynamic. They fear not being accepted and so they run away from judgement and being judged as unworthy.
Fear of Losing:
They are afraid they won't be able to keep you. So it's easier to push you away by being cold and distant. Because then, when they lose you- it won't be because of them, but because of their actions. They want to make it so they can't lose what they don't have. If you never wanted it to begin with, then you won't be mad or sad when it's gone. If he runs you won't truly know him and his flaws. He never lets you get close enough to judge who he is. You'll walk away because of how he behaved and not who he is as a person.
Fear it's a Trick:
He thinks he's unworthy of love and should therefor be punished. He fears and suspects connection is a trick that is tempting him and testing him. He feels he is unworthy of bliss and happiness. He feels the connection is a test to see if he is selfish or naive enough to reach for the twin flame love. He is scared of reaching for it and then it being taken away. He fears he is being delusional and that the connection is too good to be true. He is afraid of believing in something that could be an illusion. He doesn't want to depend on love if it's going to be taken away or if it's just a fantasy.
Fear of Being Consumed:
He fears being consumed by you and the emotions. He has been obsessing just as much as you have. There is an intense longing. These emotions are overwhelming for him. He feels and amazing and at the same time feels the connection is painful. Parts he needs to heal are surfacing alongside of the love connection. He feels consumed by your love and your soul. He hasn't been taught how to process and handle these emotions and they are exhausting for him. He shuts them off and shuts you off too. He can't concentrate on life at all. But when he wants to feel the intensity of the connection again he comes back around.
Ultimately the runners are scared that if it doesn't work they are left with nothing. He wants to go back to normal so when/if you are taken away- he still has something left and can pretend it was nothing extraordinary anyway. He won't let himself taste a life with you. It is imbalanced and not fair, but they are being cruel to be kind. They see weakness in the connection. The Connection makes them feel out of control which makes them feel they need to be strong and cut it off.