It's romantic. And also stupid. And also callous to everyone else. Some actions can be all three at the same time. Sometimes the more stupid and reckless a gesture is, the more romantic that makes it. Humans are weird that way.
His new woman can feel even more loved by him for knowing that he not only crossed the Irish sea for her, but he also went to jail for her. I hope he stays there long enough, and experiences enough discomfort, and has enough chances to think about possible death and about his kids, that next time he will decide to be just a wee bit less romantic...