i guess we can't edit anymore.
Lets rephrase the above, but repackaged in "reality format" (you of your own admission are a realist)
1. Indefinite Hold? That is nice talk to help you sleep at night. The wedding is CANCELLED.
2. Sadly, for unknown reasons, you had no input or influence on your own wedding.
3. Nobody would have concluded "relationship issues" but since you said it first, I think it is. Two people do not get engaged, set a wedding, then cancel it, and not have "relationship issues" as a portion of the cancellation package.
4. Going to class at UPS, a major achievement (congrats, now lets maybe get some of your aviation success to bleed into your personal life), is reason to get married, to celebrate, "I made it", etc. "No more eating Ramen soup, living on CFI pay" etc. Getting hired at UPS is the antithesis of a reason to CANCEL a wedding. Re-set the date, ok. CANCEL IT? By the way, since you stated that you cancelled it, own up to it, and stop using "indefinite hold." That is wishy-washy talk, more delusions that are not helping you two.