The midfielder signed a pre-contract agreement with the Perth club in January before having a change of heart and stating a desire to remain in Dingwall for family reasons.
A lengthy dispute between the two clubs followed before an agreement was eventually reached in June for Saints to cancel his contract.
Brittain's wife Diane has now spoken out about what she described as a "horrific pregnancy" and the subsequent post natal depression which prompted the U-turn.
She wrote in an online blog: "The decision to stay in The Highlands was a family one. It was decided that was what was best all round in order for me to recover.
"Doesn't everyone make decisions based on what is best for their family? The difference is others aren't judged and criticised for it by complete strangers!
"I can understand fans in Perth being disgruntled, of course I can, but that doesn't excuse some of the disgusting abuse they have subjected my husband to."
She added: "The decision to stay was without a doubt the right one for our family.
"What other people think means little to me but it's gone too far when the person who has been my biggest support is getting abuse on a daily basis.
"We made the right decision and maybe in time fans will realise this was a decision based on what was best for the whole family, and not a football/money based one."