What do you feel when you are in a union? Physically I and my twin are separated but I am sure that we are together somehow and things areas should be. I have no more neediness to be with him, though the love is bigger. Is this surrendering or union?

I believe you! I feel the same way — it is way better than Surrender, it is healing plus hope. I love how you say that love is bigger because I feel that too!

You are one of the lucky few Twin Flames who manage to achieve happiness this way. This is the meaning of a Twin Flame Union. You feel the shared energy of Oneness takes you over, and the more you open your heart to embrace the energy of oneness, the bigger the love feels.
Once you come out of the separation phase feeling more united with your Twin Flame more than ever, it is the true description of the term that Twin Flame Separation is an Illusion.

It is the new phase after Surrender and healing that initiates you into a physical reunion.

I must admit that your question has made me realize that I am not alone going through this.
I have been feeling isolated and alone lately because I didn’t know if it was just me feeling this way or if the connection progresses this way.

By the way, this is the most exciting phase to reach in my experiences because little is said about it yet, many Twin Flames look forward to this stage.

This is the phase when you feel that everything will be alright.
You have no worry about your journey or your Twin Flame and the future looks brighter than I dreamed of it to be.

Instead of feeling stuck in separation, every Twin Flame must know that the journey does not end at by healing the pain — healing is the beginning of Forever.

The running and chasing, the energetic cleansing, and healing are on stages of a particular phase but the Twin Flame experience has more than one phase. It is more than pain & Separation because after you enter this phase of bliss after healing, your perspective of the journey changes improves and feel in control of yourself to experience more change.

I have also struggled to understand the meaning of the new feelings of this blissful state.