Married At First Sight groom Duncan James insists he had no choice but to split with Alyssa Barmonde at the Final Vows ceremony because their relationship "got worse each week".
James told Yahoo Lifestyle he thought they were "not right" as a couple the longer the experiment went on.
Sanderson voiced similar doubts in the latest episode of the show, which is available to view on ThreeNow.
"I don't feel like Duncan's given me the reassurance I need, if anything he's put my doubts and concerns in my head for a long term relationship," she said.
However, when it came down to the actual moment, Sanderson was blindsided by James' final vows where he bid farewell to her.
"I felt emotionally rejected more times than I can remember," Duncan admitted.
"Maybe it's our personalities, maybe it's our differing mindsets but either way the gap seems too big to bridge.
"I don't want to hurt you and I don't want to continue getting hurt, so I have to say goodbye."
Now James has justified his stance, telling Yahoo Lifestyle that he didn't feel they were a match.
"I had a lot of time to think about it and what I think is a healthy relationship and what I'm looking for in a relationship and I just didn't think that we were great together, even though I think Alyssa is a great person," he said.
"I know what a really good relationship looks like and I know what being in love looks like. I've also had some bad relationships, and I'm going to trust myself and my gut to make the right decision for me - and for her too.
"I can't make a decision for Alyssa, but it's not good for her to be in a relationship that's not right if it's not right on my side.
"It felt like we had an amazing, great connection at the start of the experiment, but as the experiment went on I felt like it got worse each week."
James has also hinted he would be keen to try a dating reality show again.
"I'd definitely be open to looking at finding love in some other way. I thought it was a great experience, even though there were some hard times, and I'm definitely still trying to find the right person for me.
"Who knows what the future holds? I wouldn't say no to anything."
Married at First Sight continues on Three and ThreeNow.
