Postpone or cancel?

It's going to depend on the contracts you have with your suppliers, so you really need to check the small print.

Have you looked into getting relationship counselling to see if you can resolve your differences? I definitely wouldn't go ahead with the wedding until you have sorted this out - while it would be very sad to end up losing money or paying out for a wedding you didn't end up having, it would be a lot worse (and more expensive) to go ahead with the wedding and then end up splitting up.

Sending best wishes - I hope you are able to sort things out very soon as it must be so stressful for you x

You could ask your wedding planner, but it might be easier just to contact the suppliers direct. I would do this as soon as possible to find out where you stand - you don't want to find out that while you have been debating what to do, you have passed a deadline on which the payments increase! Your wedding planning might be able to help liaise with suppliers, but do bear in mind that she is not a neutral party, so while it's fine to accept her help in negotiating with suppliers, I wouldn't take her advice on whether to cancel or postpone - because that is a decision that needs to be made solely by you and your OH based on the state of your relationship and how resolvable your issues are.

Personally, I would keep it brief. They don't need to know the details, so just saying 'personal circumstances' is fine, especially as you don't know when or if you will be going ahead.

Many vendors allow you to reschedule the wedding 1-2 times, but it depends on their policy. It’s best to discuss it directly with them. If you decide to cancel, you may face fees or lose your deposit, but some companies might offer a partial refund. I hope everything works out for you both!