Here’s some more that have crossed my mind:
Feeling like your partner isn’t attracted to you or when they are aroused then it’s a quirk mood of theirs and not really them being aroused by your company.
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Feeling taken for granted, not feeling looked forward to, little talking or sharing other than eating a few meals together and lying in the same bed watching tv or whatnot.
Feeling like you come last in importance to your partner. Maybe they’ve taken up extracurriculars they don’t include you in or they give their energy to their jobs, their kids, their pals and then say they’re too tired to “argue” with you over your needs and wants that you still want to include them in.
When a partner hates the other’s job or circle of friends and feels one or both have a negative impact such as partying/drugs.