Oh, I think this is on both of them and they both share blame.
Harry 100% rushed into marriage after less than 18 months in a long-distance relationship. He had a history of failed relationships where the women ultimately blamed, in part, the British tabloid media's invasiveness as well as his own, as noted above, unresolved emotional trauma related to his mother's death and life in that royal fishbowl. He jumped, way too fast, into proposing before Meghan had lived in the UK long enough to really get a feel for what was to come because he was scared she would walk away. And, honestly, if you read Spare, you get a sense of the anger in him simmering just below the carefully constructed facade that he dealt with by drinking too much and emotional outbursts that were a LOT for those around him to handle.
Meghan also rushed into the marriage - she wanted the level of fame that came with being a member of the world's most famous royal family. She also came from the entertainment industry which has a different attitude toward accepting luxury goods & clothes than the BRF - the BRF doesn't do endorsements, instead, you pay for your clothes, etc, plus you don't wear jewelry from questionable givers like MBS unless it's been approved by the government. She really did not understand that the BRF is accountable to the British public and how those optics matter in a way that Hollywood doesn't concern itself with. I think she really believed that royal life really was all about hobnobbing with celebrities, having the best seats at Wimbledon, wearing designer clothes to charity galas, cutting media deals on the side (remember Harry suggesting to the Disney CEO at The Lion King London premiere that Meghan would be a great narrator for some documentary?), and being able to handpick her "projects" with very little oversight or input from anyone - certainly not the Cambridges (when they were still sharing an office & communications team) nor the Prince of Wales (despite the Duchy of Cornwall funding them entirely), and maybe even not the Queen herself. She just didn't think any rules applied to her - which is also Harry's fault because, again if you've read Spare, he certainly didn't seem to grasp how he really wasn't equal to William in the hierarchy and that things like HRH Prince/Princess titles were likely to not be in the cards for his own kids regardless of who he married, or that he and his wife weren't going to have an open checkbook for housing and clothes. It just never occurred to him because he never paid attention to any of those things. And, when it became apparent that royal life was not at all what she had envisioned, Meghan started, as she had done in the past, looking for an exit strategy that WOULD get her what she wanted. In Harry, she had a perfect, emotionally immature and still-traumatized mark and it was easy enough to cast herself in the role of the hounded, harassed innocent who only he could rescue.
But, really, that's on Harry when it's all said and done. He wanted out as much as she did - and he's said that many times over the years, long before he met Meghan. She just gave him the path by which to pursue his long-desired exit from the BRF. All of his protestations through the years that he'd never leave because he knew William needed his support? Hollow. If they were truthful, he'd have not behaved like the selfish, emotionally stunted man he really is. And, let's not think for one second that Meghan is "sharing" information with close friends (or Omid Scobie) without Harry's by and leave. I've come to believe Meghan would be perfectly happy living the Hollywood celebrity fake philanthropist lifestyle that she now has and that most everything now coming out is being driven by Harry's inexplicable jealousy of and anger towards his older brother. He is boiling mad that he didn't inherit the Duchy of Cornwall and that he and his wife actually have to earn the money necessary to fund their lifestyle and that his only real currency/earnings value is because he is a Prince of the UK and NI and nothing else. There's no value beyond the accident of his birth family, but he is too immature to accept (or maybe even realize) that he threw away the outstanding opportunities he had with his excellent education to either attend university or pursue a real career with the British Army.
Meghan is a go-getter and a hustler. She will land on her feet just fine. The real question is how long does she continue to put up with Harry? They both have toxic character traits - one of hers is excising people from her life once they've outlived their usefulness. God knows, I wouldn't want to deal with Harry the man-child for as long as she has. I do give her a lot of credit for hanging on this long, but I'm skeptical we'll be talking about them as a married couple in five years.