You're right, real estate does not always increase in value, but in the current context inflation is increasing in every country and this means your money will be losing value (which conversely means your real estate will be worth more nominally, even if the actual worth remains the same). This is why I do not believe prices will go down, at least over the next few years. They are more likely to go up. On the other hand, interests rates have already doubled (at least for loans in France, but I suspect Belgium would be in a similar situation) and are likely to keep going up.
Obviously the current political situation is volatile, especially with Ukraine, so things could change hard and fast. But considering the ways things are going, right now buying is a good idea - and you're losing money every month you wait. I am not saying this to hurry you up - once you've bought something your capital is tied up for a good while so you should be confident that this is what you want to do. But my recommandation is to make a decision to either buy or not very soon.
In my case I negotiated specific items on the mortgage that made it much more interesting to go through my bank, but this has to do with very very specific things about my income. In your case I'd recommand to do both - see what your bank has to offer, that won't cost you anything and your bank knows you best so may offer good terms. Then, with this knowledge, speak to a broker and see what they offer and whether it'd be worth it. Usually a broker can negotiate better rates but you need to know what your bank offers before you can know for sure whether it's worth it. (I did speak to a broker myself and he recommanded I go with what my bank offered).
I was not suggesting you buy a car btw, I was just trying to illustrate that being an owner, be it of a car or a house, isn't such a huge responsibility. It's natural to feel nervous about tying up this much capital, but once it's done you probably wouldn't even think about it on a daily basis.
No children does make you more flexible but in your old age you may enjoy the sécurity owning brings, and the additionnal income (no rent = more disposable income). Obviously you could also invest your money somewhere else but there aren't that many investments that will pay you reliably the equivalent of a rent for the rest of your life.
I highly recommand you speak to your bank and a mortgage broker, as well as a few real estate agency nearby (or take a good look at offers online), and THEN you can make an informed decision. By all means also ask your bank and/or any other financial advisors about other investments.
When you have all of the data, lay out your options on paper and decide.