2. Do you trust each other without question?
Do you wonder where your partner is on a night out? Do you need to know every detail about where they were or who they were with? Are you ever tempted to check their phone messages for email? If so, you can't answer yes to this question.
3. Do you both feel that you are the lucky one in the relationship and acknowledge it regularly?
You should never feel like you're the 'lucky one'; this needs to work both ways.
4. Can you both imagine the long-term future and being old together?
If you've talked about how you imagine spending your old age and you're in each other's scenarios, then this is an obvious sign of relationship longevity.
5. Are you best friends?
You tell each other everything, you speak every day and you laugh together.
6. Do you like each other's family and friends?
Our friends and family define us, if they like you and you like them but your partner doesn't, something doesn't add up.
7. Do you support each other's decisions?
For all the major decisions - whether it be work, family or financial - are you on the same page? Or even if you can't be in complete agreement, can you support the final decision anyway?
8. Do you do things apart?
If you do everything together, you will soon run out of things to talk about. Having your own hobbies or just seeing friends separately adds interest to the relationship and makes you appreciate the time you have together more.
9. Do you have interests together?
A healthy relationship is about finding the right balance between question eight and nine. There should be a least a couple of things you enjoy doing together on a regular basis, whether it be a joint favourite TV programme or a shared hobby.
10. Do you agree on the big stuff?
The small and medium stuff doesn't really matter - you can debate that or come to a compromise - but it's the really big stuff that matters, like the way you bring up your children. Ask yourself whether you even want children, major financial decisions and where this relationship is heading.