All love is unrequited to some extent. That's something you have to accept about the real world: That there is no magic in love. It feels like magic, but that's because four billion years of evolution have built you to feel that way about it. I have fallen deeply in love with people who never returned that affection. Given everything I had to try and get people to love me during times where nobody did.
One of the greatest phrases I've ever heard about love is thus: "Love is happiness
shared." Nowhere in that statement does it necessitate or imply that love goes both ways. A compassionate person can show love toward the ungreatful, a parent can buy toys for a kid who doesn't care. Love is something you feel, it's not something that magically defies laws of physics to connect two people with some sort of fucked up telepathy.
I'm lucky enough to be in a loving relationship with a beautiful woman (
@Seba hello darlin') but it wasn't something I got by just throwing my love at people. Throwing your love at people who don't want it emotionally is codependent, and throwing it at people who don't want it physically is, you know, rape. I am a hopeless romantic at heart, but I waited three years for a real relationship. I didn't just throw my affection at whoever was attractive to me, I talked with them, got to know them, and asked myself if I could live with them when we aren't feeling lovey dovey.
After all, it's possible to love people who are bad for you, and no matter how intense your feelings of love to someone (or someone to you), those feelings rise and fall like the tides. Some days you want to cuddle and eat popcorn and watch shitty romantic movies by candle light. Other times, you just want to spend 14 hours straight playing the new XCOM while your girlfriend goes on a Disney movie marathon. It doesn't mean you aren't in a relationship anymore, it just means that love will wait another day to express itself.
Tldr: You can feel love without a relationship. The best relationships involving love also involve equal or greater amounts of friendship and trust.