Will my spouse divorce me if I ignore them or pursue others?

I'm trying to figure out how marriage works. Wiki says I can either talk to my wife/husband and it will gradually make them happier up to a certain threshold, but it doesn't say much about ignoring them. The only info it has is they may say rude things, but that's about it.

It's currently winter and so I can't marry anyone yet (because a certain NPC required for this does not appear in winter, apparently), so I'd like to prepare while there's still time. I've adopted a cat earlier and all it does is block my way to item storage during rainy days when it teleports inside the house, making me wish I could disown it. And I "touch" it every day and get "love" in response. I'd like to know what my spouse would try to pull if I ignore them or gave gifts to other people.