How long does it truly take for someone to learn what’s necessary to navigate a relationship effectively?

Is it unreasonable to spend time together, like meeting three times a week or at least twice a week for a one-hour dinner even when you had a long day? Is it really so hard to make the sacrifice of sharing meals twice a week and having meaningful conversations?  Even once a week would have been nice.  I feel like I am an alien.

Is it acceptable to act otherwise? And after 2.5 years of knowing someone, if a promise was made, why would your perspective suddenly shift so drastically without discussing it with your partner first? Is that really okay?