Although it's good for your relationship for both your and your partner to do things without the other person, some of the specific things that they (or you) do alone can actually give you some insight into how they're feeling about the relationship. Having solo hobbies like attending a weekend yoga class, playing a sport with friends, or exploring new coffee shops without your coffee-despising partner isn't a bad thing, but if your partner does these six activities without you, they're checked out of the relationship and the two of you might need to have an honest conversation about what's really going on.
If you recognize that your partner does these things without you, it doesn't mean that the relationship is definitely over, but it does probably mean that there's some sort of problem there. Whether they're truly checked out and just can't be bothered to end things or there's something else going on, you're likely going to have to talk about it together in order to move forward. Also, there can be some exceptions and ultimately, you and your partner probably know your relationship best, so just because they've done one of these things before doesn't necessarily mean that they're done with you or have completely checked out. But if you notice that these things are happening more frequently, whether it's you or your partner who's doing them, they could be red flags that all is not well.