For me, the 2 big tests that every girl should do during her relationship to see if she's compatible with her lover are: living together and going on vacation with him.
The 3rd big test is during the breakup, where you will see his true face in case he wants to be the victim and not you - we will analyze this in another article.
So if you're in a relationship - I'm not talking about a relationship that lasts just 1 month, but I'm writing about relationships that last longer - then the first thing you should do is arrange to go on a trip in case you haven't discussed the possibility of staying together yet.
On the journey you're talking about, my dear friend, you'll see if you're compatible, you'll notice how he wakes up and how he sleeps - and I don't mean if he sleeps on his stomach and if he wakes up on his back, I mean how he'll be in his mood -, see, girl, what your chemistry is like.
Because it's good to go out all the time and things like that, but it's one thing to go out while you have other obligations and another to live a few days together somewhere far from your homes without anyone bothering you.
Personally, when I went on a trip with my relationships, I saw different faces than the ones I saw in my everyday life. That is, I noticed that while everything was perfect when we were together in Athens, on vacation the perfect moment turned sour, or I simply realized that we didn't match as well as I wanted.
The biggest test, however, is staying with him: There you see everything, from how he wakes up to whether he will offer to help you with the housework.
I've experienced this scenario too and I can tell you that at first everything is fine, then due to routine/habit and the like, things change more or less because maybe ultimately that cohabitation should have happened, on the other hand of course it was also a wrong decision that became apparent along the way, but I don't regret it because that too was and is an experience.
But they don't change because we want to, but because we got bored or because we finally realized that we don't want to be with this person anymore, so we change them and make decisions about what we want to do from now on.
Finally, before you ask him to go on vacation with you or stay together, you need to keep in mind that not all relationships have the happy ending we all look for. In the back of your mind, keep in mind that you might not be a good match after all.