Derek Mitchell claimed he was “devastated” when he read she had cheated on him with a footballer and that at the time of the alleged affair she was pregnant with his son.
He said on another occasion they argued after he “defended her honour” at a party when she was compared to singer Susan Boyle, but denied breaching the peace at her Eaglesham home.
The 35-year-old also told the court it was a “physical impossibility” he lifted her off her feet by the throat on Christmas Eve 2009 at Mitchell Street Car park and said at the time there was no assault but she was “furious” when he ended their relationship.
Mitchell claimed his then-partner phoned the police out of spite and that although they split up, there was contact between them before they re-kindled their relationship in February 2010.
He was giving evidence at his trial at Paisley Sheriff Court where he faces a total of six charges including breach of the peace, breach of bail and four assault charges.
In evidence his defence lawyer Billy Lavelle asked if alcohol was a problem in the relationship he had with Miss McGuire.
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Mitchell told the court: “Alcohol was a problem for both of us, added to that Suzie had a problem with cocaine as well.”
The court heard that while at Miss McGuire’s cousin’s party at the Ivy Rooms in Ayr, in November 2009, Mitchell was involved in an incident that led to him being arrested and later released.
He told the court there was a disagreement about “how he defended her honour” when Miss McGuire was compared to singer Susan Boyle.
Mitchell told the court the following day he argued with her over the incident the previous night.
He said: “It was fairly uneventful, she was unhappy with the action I took to defend her honour because I took it to be an insult Suzie, my girlfriend at the time, had been compared to Susan Boyle looks wise.”
Mitchell was asked if an earlier allegation that he grabbed her by throat had any truth to it and he said “none whatsoever”.
The court previously heard from Miss McGuire that she was throttled and bitten on the face by her husband on Christmas Eve 2009
Mitchell denies the charges and the trial before sheriff Susan Sinclair continues.
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