Hi there Holaitzchica, glad you found us, and welcome

When we have a loved one or family member with BPD, as much as they need help,
we need support, too. This group has been a good resource for me for nearly 10 years -- having members here who really "got it", and being able to post and share here any time 24/7, has been a lifesaver. It's wise of you to take time and support for yourself.
Can I ask, how long have the two of you been married? Do you have any kids at all?
When your H has suicidal ideation, does he express that verbally, or with actions? If verbally, what kinds of things does he say, and how have you typically responded? Is he open to contacting a suicide hotline?
I just recommended a couple of support groups to another member, so I'll share those here with you, too:
One great resource for a non-anonymous support group is the
National Education Alliance for Borderline Personality Disorder, which runs the free
Family Connections Program. It typically runs 12 weeks online (there are some shorter versions) and when I attended (due to my husband's kids' mom) I found it very helpful and understanding. There is a waitlist; my wait was ~7 months, so I'd recommend signing up now for sure. If your H also struggles with suicidality, they have a
Managing Suicidality & Trauma Recovery Program that may have a shorter waitlist. (edited to add: that class is designed for when your child, not spouse, is suicidal, but it could be worth trying)
Another resource is the
National Alliance on Mental Illness, which offers free support groups either virtually or in person in the USA. While I haven't participated in their offerings, and they're not BPD-specific, I have heard they are reputable and well regarded.
It must weigh on you so much that he already struggles with BPD/PTSD/GAD and is now having suicidal ideation. I just really feel you when you say you're doing your best

I'm curious if you have a therapist or counselor for yourself right now? For me, even though it's not my husband with BPD (it's his kids' mom who has many traits/behaviors), I've still needed a therapist, because the BPD dynamics still get into our family system and it can be overwhelming. I've needed that support, and I hope you can find a T if you haven't already.
Looking forward to hearing more from you;
kells76