I believe if you love someone, you want to them to grow and become a better version of who they are now. I got great advice from my boyfriend's mom that takes this a step further: don't enable your partners worst behaviors. Be willing to stand up to your partner when they do something shitty, and have a discussion about it. Don't stand by and let them get away with shitty behavior, because it's just going to get worse as the years go on.

If you don't feel comfortable talking to your partner about these kinds of things, then you should take a step back and evaluate whether it's the relationship holding back in this aspect, or if it's just something you need to work on. Also, you don't need to yell at them or make it a big deal, it can be a simple conversation such as, "Hey Bob, (insert bad behavior) bothers me, because (insert reason)."

An example of this is with my boyfriend and dirty dishes. When we first started dating, he had a habit of leaving old dishes in his room, because he'd get consumed in a project or schoolwork. After we'd been dating for a couple of months, he'd asked if there is any pet peeves I have, and I told him point blank that I thought leaving dirty dishes lying around is gross, and it bothers me. Since then, he always makes an effort to clean up before I get to his house, and now he leaves maybe a plate behind every once in a while.

Essentially, we all love our partners enough to support them and want them to be the best version of themselves, so if you notice something they do that bothers you, talk about it with them.