The 39-year-old pub manager told The Fix that his former relationship, which lasted 10-years, left him so heartbroken that it still affects him today.
He told the publication, 'It was difficult breaking up, it wasn't like either of us did anything wrong - there was no cheating or anything like that.'
'She became a fitness freak but was just crazy. We slowly drifted apart and that was it, we were done'.
He added: 'We had a five-acre property together, and she ran out of time for me and the animals. It was really hard because I had to take responsibility of the farm. I got all the animals. When we broke up, we had nine dogs, two alpacas, and two horses.'
Sean further described his breakup as 'really hard' and 'stressful' because he believed they would spend the rest of their lives together.
The TV groom's response comes as Australia watched on in horror at the couple's completely varying reactions to one another.
The bubbly and outspoken Jo fell instantly head-over heels for her future groom, while Sean muttered 'Oh s***' under his breath, and asked to speak to a producer.