John Stamos, known for his role as Uncle Jesse on “Full House,” has opened up about a painful chapter from his past. In his upcoming memoir, “If You Would Have Told Me,” Stamos, now 60, shares the gut-wrenching story of discovering his then-girlfriend, Teri Copley, in bed with none other than Tony Danza in the 1980s.

Stamos describes the incident as “physically painful” and “worse than anything.” “I can’t explain it, but I would’ve rather been punched in the nose again or something because the pain is so overwhelming,” he recalls. “Looking back, it’s like, probably, she wasn’t the right girl for me. So seeing him, realizing it was him and stuff, it was hard. I mean, it was awful.”

The actor walked into Copley’s guesthouse one fateful day and found her asleep in bed with a man he did not immediately recognize. Stamos was left breathless at the sight of the stranger, who he recalled had “ripped abs.” Stamos stumbled out of the room in shock, saying, “At first I was like, ‘I’m going to kick his…’ I didn’t know it was [Danza] yet. I see his abs. I’m like, ‘Maybe not. F— it.’ And I ran. But I remember running down the driveway with tears streaming down my face and I didn’t want anyone to see me.”

Copley, now 62, claims her relationship with Stamos was already over at the time of the incident. “I wondered, ‘What was John doing there?’ because we had broken up. He just looked at me and shook his head, and walked away,” she said.

Stamos later addressed the affair allegations on “The View.” He suggested that if they had broken up before the incident, it was only for “just a day or two.” He also claimed that Copley hadn’t “told [him] we broke up.”

In his memoir, Stamos reveals that he identified Danza as the other man when he saw a poster signed “My Dear Tony” in an unfamiliar car parked outside Copley’s home. The memory of that revelation stayed with him for a long time.

Despite the pain he endured, Stamos characterizes Copley as “just a nice person” and reflects on his immaturity at the time. “I mean, it wasn’t right to cheat on me, but I was too immature; I wasn’t a man,” he admits.

Stamos chose to share this incident in his memoir so readers can understand that even someone who seems to have it all can go through painful experiences like infidelity. He suggests that people who are cheated on often try to find reasons for it, such as financial insecurity or lack of attractiveness, but sometimes people are just “s—–. And it’s life.”

The actor also points out that life has its way of balancing things out. He credits Tony Danza’s popular show “Who’s the Boss?” with contributing to the initial success of “Full House” since it was the show’s lead-in. In essence, Danza played a part in launching Stamos’ career! See him chat about that below.

Can you believe anyone could cheat on John Stamos? Do you think sharing such personal experiences in a memoir can help others who’ve been through similar situations?