PEX w/compression fitting type shut off valve

Hey all,
I've got an existing 1/2 PEX supply line going to a compression fitting type shut off valve (brass ring inside fitting). I have since replumbed the remaining connections to the fridge as I had a compression fitting completely fail (1/4 inch tube to tube off the fridge .. didn't tighten it enough apparently... big flood while I was gone).
I have since replumbed the line with a threaded icemaker supply line and just one 1/4 compression fitting side to connect to the fridge. I purposely pulled on the shutoff valve and tried to crank it down as tightly as I could. Through all this, this valve and fitting has yet to fail or leak. However, after my screw up with the 1/4 in (which I did not pull on or test enough) I'm worried that this PEX to shutoff compression might spontaneously fail or leak? From what I can gather .... if it hasn't failed yet and holds up to average handling it should be secure? TIA for any advice on this.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.