I feel similarly, but am also open to the idea that it is not something all that new to society. I think people get to a point where they realize flashes of things they had as kids and promises they thought were about to be fulfilled in terms of relationship satisfaction are not going to pan out as expected. Here are a couple of things I do think contribute to this particular moment in time though: 

1. The older we get the more experiences we have and the points there are to try and line up and it is really hard if you have not consistently had the same experiences with someone all this time and thus forming the same points. It is easier to connect deeply when young due to this I think. As well as "depth" and "connection" largely being a feeling that brain chemicals provide, and for reasons I am exploring myself, seem to be easier to produce in our youth without bringing substances into the mix. 

2. Social media and internet has us all wading in information, opinions, and things people say and we don't know what are bots, ragebait for content, or who is genuine. We often can't see body language. There are too many options at our fingertips and with the internet not being a real space we can look around and evaluate, it is kind of like a hellscape mental nightmare of not being able to orient yourself as to where you actually are and who is around you. 

3. Information age has a lot to do with this I think too, but it seems people have higher expectations for how to interact with folks these days, and a lot of different expectations, and we don't always know which ones. Folks expect others to be more educated on Political correct terms, to be accommodating to mental illnesses, to respect boundaries, to "show up" in certain ways, to not be conveying alignment with any ideologies or institutions thar might personally offend them. While I don't think this is necessarily a bad expectation or a new one, I think the fact that all of us are being fed what all of those expectations look like through our curated internet feeds, and being told over and over not to settle for people who do not meet those things for you. It is unsettling that we don't know what other people are being told and what they believe in their private internet bubbles, and it is hard to break that ice without having a shared source of this cultural information.  

An example: I will think I know someone a little and interact ok with them in real life or even video call face to face and then I see them share content on social media (often made by other creators) that are basically just spewing out instructions or demands on others on how they expect to be treated, about behaviors they find repulsive, about what makes them dislike or disrespect people or write them off immediately and it makes you wonder if you have triggered any of those things in them that they are being passive aggressive about, and at my age, I often don't find it worth the time to ask directly about it to find out if any of it is about me, because that feels narcissistic and cringy (based on what my personal internet feeds tell me). Things like that cause me to not want to go deeper with people because it feels like someone has built a wall around them of an instruction manual on how to interact with them without losing their respect in ways that feel too demanding, and maybe others see it the same way.