How to Convince a Horse to Trust again...

Hywel is a 26 year old Welsh Cob who had traumatic experiences as a foal. He has a great connection with his owner, who has him since he is 6month old - but trusting only one person can be very stressful. Especially since taking care of horse involves multiple people. He has no positive connection to touch and I try to convince him that life is less stressful, when he gives himself permission to trust again.