What is something you should know before having a distance romantic relationship ?

You are gonna have the impulse that everytime you do meet in Person it has to be very intense and special. Try not to fall into that.You will burn yourself out this way. Try to still have time together where you got nothing planned and just want to be there for the sake of it. Even if it means being bored together.

Don't.

But really, relationships are hard in person, long distance is juat torture.

Have a plan to both see each other regularly. And also have to set an end date where you’ll be together and no longer doing long distance.

I had one and it worked out. We were able to meet once a month in each other’s city or a new city. We agreed that we’ll quit our jobs and travel the world for a while after she’s done with her studies. After that we’d return and move to a new city together and now married.

We couldn’t have done it without having a good enough income to travel regularly but not tied down to move for each other. Without this end date it also wouldn’t have worked. We needed to work towards something.

Do you know each other IRL and are now switching to long distance, or has your entire interaction been online?

I know him for 1year and we are together for 4month... But I'm going to leave for uni in September (so I'll be in another town)
- Of all the people from my freshman year of college who had long distance relationships at the start of the year, none of them were still in those relationships at the end of the year. That’s an incredibly hard / bordering on impossible time to maintain a distant relationship while you’re going through such an exciting time in your life. I’d say set yourselves free.
- Well, it depends. Will you be commuting home for the weekends or only visit a couple times a year?
  
  In any case, leaving for uni is long term and without plans for moving together i don't think it can work.

That is probably won't last and do you really want to lock you and the other person in when there is logically very little way to progress this fully without an effort to move closer.

It's difficult and painful. You will feel lonely many days, but can't act upon it because you promised yourself to someone else.

Think how long you will be long distance. Do you really want to live like this for that long?

Expensive. Won't last.