why cant i seem to find a deeper meaningful relationship?

You're smart to ask about it, because when people fall into a pattern like this, there's definitely something wrong on your end.  Obviously, you want to figure out what it is!

The only thing I can come up with is these guys want sex, but "when it comes to something deeper" they bail.  This reads like you might be having sex too soon.  Ideally, you'd have a sense that they're looking for something long term and, more importantly, see potential that you might be that person BEFORE having sex.

Obviously, this is just a guess, but if that isn't the problem, you might talk to your best friend about it.  Also, on the LTRs you DID have, is there any pattern in how or why they ended? 

Please don’t take this the wrong way...  It’s you.  Here’s the thing, as a person (male or female) ages, their mind, their thought processes ages and gets more complex.  What happens is your criteria for a relationship gets more complicated and you become more discriminating, this is true in both men and women.  This means you’re probably in the higher percentile of intelligence as well.  

The only way to overcome this is to sit down with yourself and make an inventory list of all the things you want from a relationship; then tear up that list and start over.  Write a new list but only write three things on it, the most important things.  Commit those three things to memory and forget the rest, you’ll find yourself looking at a larger pool of potential mates.  In essence you’re casting a larger net.  With any catch, you’re going have to throw some back, but that’s the process.  

I’m 55 y/o and know several confirmed bachelor’s my age or older and one thing I always see is that they get too damn picky when it comes to women for their own good.  This happens for women too.  

If you really want to find a mate, you need to be willing to accept more imperfections.  

Sounds like the guys you are attracting are young or immature. You might have to look at a slightly older man who is open and honest in his wants and communication.The 3 keys and foundation of a healthy relationship is total open and honest communication, trust, respect and healthy sexual relations. Just a slightly older guys prospective.....Rob