you can love someone and still murder them in cold blood without remorse btw!!! the two are not mutually exclusive and to suggest otherwise is a very heteronormative point of view!!!!
Honestly? My main piece of advice for writing well-rounded characters is to make them a little bit lame. No real living person is 100% cool and suave 100% of the time. Everyone's a little awkward sometimes, or gets too excited about something goofy, or has a silly fear, or laughs about stupid things. Being a bit of a loser is an incurable part of the human condition. Utilize that in your writing.
First you procrastinate on the task because it is not a big enough deal to get done urgently. Then you procrastinate on the task because it has become such a big deal that doing it is overwhelming. You would think that this implies a middle point where it is just big enough of a deal to get done easily, however the inherent perversity of the universe's causal geometry prevents this