You have no doubt heard “fake it till you make it”. I have seen some studies that say this actually works because actions change how we think and feel. In fact, one study went so far as to show that Pretending to have superpowers actually changes you.
This means you can become a better husband by “pretending” to be a better husband. You can become more loving and sacrificing by acting out those things. Decide who you want to be, play the part, and you will become that person. Choose how you want to treat your wife, start doing it, and in time you will start feeling that way.
Initially this is difficult – playing a role takes effort and concentration. Stick with it; as it starts to change you, playing the part will become easier. In time, it will become natural.