People really misinterpreted Steve's conversation with Tony at the end of Age of Ultron didn't they. Of course Steve always wanted a life with Peggy and he's even haunted by the life he could have had with her from the visions he experiences from Wanda and looking on seeing...

that Hawkeye has his own family. The simple life. By this point in the MCU Steve just had to come to terms with the life he has now. He's the man out of time and has to try to make some kind of life in a modern world but it's not like he's ever truly moved on from Peggy. He....

still always loved her and wants that life with her but he has to make with what's given to him now. But when he has that opportunity in Endgame your damn right he's gonna take it. It's completely justified and he's earned the right to pass the shield on and retire. After...

everything he's been through he 100% deserved and earned to get that peaceful life with Peggy he's always wanted.