Ed Swiderski and Jillian Harris Split: Ed Cheated on Jillian?

Jillian Harris and Ed Swiderski, who got engaged on 'The Bachelorette' last season, announced their breakup yesterday.

The two stayed engaged for a full year despite rumors of his infidelity following their engagement. It was alleged he had two girlfriends on the side as he was courting Jillian' affections on the show.

Friends of the couple now believe his playboy shenanigans are to blame for their sudden split.

"We think Ed was doing shady stuff during their relationship," an inside source told RadarOnline. "Jillian knew but couldn't put her finger on it."

Friends recall an incident about a month-and-a-half ago when the pair flew to Los Angeles from Chicago and Jillian stayed with girlfriends while Ed stayed with the guys.

The morning after a night out on the town, Ed's pals had an early tee-time to play golf but when they went to pick up Ed, he couldn't make it. "I believe he had a girl with him and had no way to get her out of the house," revealed the source. "They all knew he was a player."

Former Bachelor contestants close to the pair knew that there was trouble brewing. "Jillian thought that she could change him," says the insider.

Confirming the split, Jillian told UsWeekly on Wednesday, "I love him and I'm really sad, but I have to look out for me," .

"We're both kind of resetting," Ed said. "Jillian isn't happy and I'm definitely sad about the whole thing, but we got to work through some things on our own if we decide to move forward."

At least Jillian and Ed are playing it classy so far. They are not running to the tabloids to cash in on their breakup... à la Jake & Vienna.