My wife’s behaviour resembles BPD

I’m the husband(36) of a woman(36) I strongly suspect may have undiagnosed BPD, and I’m looking for insights from you and from partners who’ve been through something similar.

Some context (short version):

We have a young child. 1.5 yo.

My wife’s emotional state can shift very fast. Sometimes she is warm, loving and very attached to me. At other times, she becomes extremely angry, yells at me, and has even yelled at our child in a very high‑pitched, frightening way, including when he is drowsy or just waking up.

When she is angry, it feels like I suddenly go from “good partner” to “the worst person ever”. She says very harsh, devaluing things about me and sometimes about her parents too, and later either acts as if nothing happened or minimizes it.

This pattern was already present before pregnancy. The intensity increased after we had our child, but the core behaviors (sudden rage, devaluation, emotional shutdown, very black‑and‑white views of people) have been there for years. Because of that, I don’t think this is just postpartum depression, even though having a baby has obviously added stress.

She has very few close connections apart from me and her parents. I often feel like I’m her only emotional outlet and also the main target when something is wrong.

These cycles repeat, and I’m increasingly worried about the impact on our child and on my own mental health.

My questions:

- Is this what “splitting” looks and feels like from the outside?

When she is upset, it feels like I’m suddenly all bad, and when she is calmer, I’m back to being important and valued again. There’s not much middle ground. She can go from “you’re a good husband/father” to “you’re selfish, uncaring, you do nothing” very quickly. She even goes far to humiliate or insult me in front of my friends or in public. Does that sound like splitting to you, or could this be something else?

- How can I mitigate the situation day‑to‑day?

If you have BPD, what actually helps from your partner when you feel triggered or when you start seeing them as “all bad”?

- What makes things worse, even if the partner thinks they are trying to help?

Are there any practical scripts or phrases that feel validating rather than attacking when you are in that state?

How do I raise the idea of professional help without it backfiring?

I am honestly scared to suggest therapy or an assessment, because I’m afraid she will feel attacked, blame me, or completely shut down.

- Is there any way to frame “getting help” that doesn’t sound like “you are broken”?

If you have BPD, has a partner ever brought up therapy in a way that you could accept and not experience as betrayal or criticism?

- For loved ones, what wording or approach worked (if anything)?

Is a “normal” family life realistically possible?

I know “normal” is a loaded word, but I mean a reasonably stable, safe environment for our child, with conflict that is manageable and not constant chaos. For those of you with BPD, or partners of someone with BPD:

Have you managed to build a relatively stable family life? What made the biggest difference (treatment, boundaries, living arrangements, something else)?

- For those who decided it wasn’t workable, what were the signs that it was time to step away—for your own sake and for your child’s?

what worries me the most are the consistent suicide threats(amongst various other threats) given that she had tried to commit suicide and was hospitalised even before I entered her life.

I’m not here to attack my wife or people with BPD. I genuinely believe she is in a lot of pain and that, if this is BPD, it is an illness, not a choice. I come from an ethnicity that this mental condition is either a taboo or non existent to my parents, friends or her parents. At the same time, I’m exhausted and scared about what our child is experiencing, and I don’t know how to balance compassion for her with my responsibility to protect our kid and keep myself sane. I have literally no one to explain all this. Although I love and care for my wife, my nervous system screams at me that I'm being intentionally or unintentionally being abused every single day. I'm in between where I no longer can take it at the same time I want to be there for my child. I am ashamed to confess that I'm too scared to leave my kid under her care alone.

I’d really appreciate honest perspectives from you and from those who love someone with BPD—especially concrete ideas on how to communicate, set strong boundaries, and suggest help without making everything explode.