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How to have a long term relationship
Start a casual relationship first.
If you're single and want to settle down, it's important that you not rush things. It can take a while to meet people, let alone meet the right people for starting a long term relationship with, so try to take it slowly at first and let things progress at their own pace.
This will work differently for every relationship, so work at your own pace. It's not usually a good idea to discuss things like marriage and children right off the bat when you meet someone you're interested in.