There’s too much generalization on here. If you fail to filter women from the get-go then you’ll be burned more times than not. OP isn’t here to look for advice, heck he hasn’t even responded since 20 posts ago. My past two LTR’s of 3 years have been great, though it didn’t work since I was (probably will always be) looking for something else. The two women were fantastic and I couldn’t have asked for anything more from them.
You will meet a variety of women over time. You’ll know what they are all about by the third date IF you qualify them. The problem is that men catch feelings too early on and commit too easily. Which makes sense given that women have a ton of options and the guy is left with what he can getfrom his pipeline. Often times, it comes from scarcity and they settle for the wrong one.
This wouldn’t be the case in OP’s situation, since he’s committed. Folks that are telling him to watch his back are those that have been burned before. Most likely due to rose tinted glasses early on. Let the guy enjoy this and if he gets burned so be it