I have been with the same partner since I was a teenager. We grew up together, and it has not always been easy. We had fights. We had years that felt heavier than others. What held us was simple: we treated each other with respect, and we both meant to stay.
If I could give one piece of advice, it would be this: love should feel safe. Safe does not mean boring. It means you are not always anxious about where you stand, or afraid that someone will walk away the moment things get hard. In a healthy relationship, you can say what you feel. A disagreement does not have to become a crisis. I say this as someone who once turned small problems into big drama.
People talk a lot about communication. Fewer people do it. You cannot expect a partner to read your mind, and you cannot build a long life on hurt you never name. Being able to say "this hurt me" or "this is what I need" without both of you getting defensive is a clear sign that the relationship has a future.
Do not treat basic respect as a rare gift. Showing up, being kind, and making an effort are not extras you should have to beg for. Some people stay because they think things "could be worse." That is not a reason to accept poor treatment. A partner who cares will try because they value you.
Love is not the whole picture. Shared values and a similar direction matter too. Before things get too serious, ask yourself: "Can I picture building a life with this person?"
No relationship is perfect. People change, and life gets stressful. What matters is whether you can look at your own mistakes, say sorry, and keep choosing each other when it is uncomfortable.
The right relationship adds to your life. It may push you to face your worst habits, but it still leaves room for you to be yourself. Healthy love should not feel like a constant fight. It should feel safe, and it should not feel like settling, as if you are making do with less than you need.