Not taking an interest
Your partner is probably not going to be interested in every hobby or interest of yours. Do you genuinely care about all of his? Not likely. But some couples will argue and insist their partner should attend every movie, lecture, and conference together on either of their interests. This only forces your partner to pretend to be engaged when he isn’t, which actually just makes him feel removed from and resentful of you. It’s better to accept that your partner isn’t interested in your hobby and do it without him than force him to fake it.