1. You get on with each other's families
OK so the fact his brother can be fairly annoying and his parents sometimes forget you're a vegetarian aside, you get along like they're your own relatives.
2. You go to bed together
Even if this involves sitting next to each other in silence scrolling through your respective phones, getting into bed together is great because it increases the possibility of a cuddle. HOORAY.
3. You're best friends
If he knows all your secrets, weird habits and about your ability to fit an entire pack of oreos inside your mouth at once, the chances are your relationship is doing pretty well.
4. But you still have your own friends
Having separate friends to dick around with and spending time apart is important, and having your own life is just as important as making one together.
5. It doesn't matter if he forgets to text you back
You're so comfortable and happy together, it doesn't really matter if he doesn't text back because he's probably fallen asleep or got really engrossed in a piece of pizza.
6. You both like holding hands
There ain't nothing wrong with a bit of PDA here and there.
7. Reading each other's messages doesn't even cross your mind
Looking at his Nando's receipts and reading about Topshop's latest discount code doesn't appeal, thanks.
8. They know your takeaway order off by heart
What else constitutes a healthy relationship, really?
9. You're not afraid to be wholeheartedly truthful
Don't like those shoes with those jeans? Not a fan of his new chicken curry recipe? No problem, speaking your mind and expressing your thoughts is exactly what your relationship is about.
10. You can easily watch a box set in one sitting together
He grabs the snacks, you put on your onesie and you both end up watching 12 episodes of Breaking Bad without even realising. Ideal.
11. You still appreciate each other
Even if you've seen that tie and shirt combo a million times before, you tell him he looks great because it's a NICE THING TO DO and you genuinely think he does.
12. You let arguments go
Thought process usually involves: "what's the point in holding the argument you had three weeks ago on a Tuesday afternoon against him when you can cuddle and watch crap telly instead?"
13. You like having sex and do it on the reg
An obvious but REALLY IMPORTANT factor in a healthy relationship, really.
14. You're not trying to change each other
All those romcom movies about 'trying to tame the bad guy' and 'trying to make the man into a better person' seem ridiculous when you're properly into someone.
15. Awkward silence isn't a thing - comfortable silence is, though
Ahh, a moment of calm to think about what Kylie Jenner's pet dog is probably up to right now.