I mean, when Saturn was in Leo I had the best time. My life was going well in all spheres. I had a great job, great friends, exercised daily, fantastic health, and I met my husband. I wish life could be like that everyday.
Last time Saturn was in Leo, Neptune was in Aquarius and Jupiter passed through Scorpio. If you have anything in any fixed sign, particularly the later third of a fixed sign, it would've been caught in that t-square.
That may have been the ripe time for too good to be true experiences that felt like both the completely real thing and the answer to your prayers. But, Neptune opposite Saturn: there would also come a time when the illusion shattered. (My sun was transited by Saturn and opposed by Neptune during that time, and yes, a variation of that happened to me). If Saturn and Jupiter formed any kind of square/t-square/opposition transit to anything in your chart, particularly Mars or Moon, that would've been a great time for a new and serious relationship. Jupiter gets you interested, Saturn gets you committed.
But it sounds like it's your marriage that's taken the greatest toll on your health and self confidence: that's what you keep posting about again and again. Illusion shattered. Ugly roots showing.
Pluto conjunct sun, or aspecting sun, is bound to bring a lot of power, and power plays, into your life. Pluto is where we have power, where we're disempowered, and where we give power away. Libra, being all about balance between self and other, is at perhaps the greatest risk of giving power away.
Keep in mind that it's the sun's detriment: a Libra sun, paradoxically, has to develop self in a rather anti-ego way. Leo, in contrast, has no such dilemma: it's very clearly about the self, and self development. Leo sun people might struggle with sense of self and self esteem issues, maybe even more intensely than other sun signs do, but it clearly is about self. Libra has to constantly balance self with other, and all too often, the other wins at the expense of self.
And I have a question - when a natal planet experiences difficult aspects, is it more important to take on the qualities of that planet? Eg: with Pluto square sun, in 2017 I experienced abuse like never before. I was damned if I do damned if I don't. But only now, 2 yrs later do I feel like I can start looking after my sun.
You already have the qualities of Pluto. Pluto conjunct Sun: Pluto and what it symbolizes is so intrinsic to your sense of self that you can't experience one without the other. But, because Pluto is conjunct your Sun, Pluto square your Sun was also Pluto square natal Pluto. That intensified the Pluto message, and Sun was caught in the crossfire. Or, to put it more accurately, drowned out in that conversation.
If you experienced a strong sense of disempowerment at that time, that is what Pluto often does. Its power is so strong that most of us feel we can't wield it, and tend to give it away. Libra is already well conditioned to give away, and give too much away. Probably, you made a deeply unconscious decision, early in your life, to give your power away instead of trying to hold onto it. That really came back to bite when Pluto squared your Sun/Pluto.