Is it normal if i only want one love?

When I was smaller, I thought there was only one love and then as I got older, it became normal to have a few loves. I'm having a hard time believing that and agreeing with that, but perhaps, people fall in love too easily now and possibly "think" they are in love. Who knows. But I do agree that your first love is the strongest in the most rewarding and destroying way all at the same time. I've only been in love once and that's right now. But you can say I have loved twice but in different ways. The person I'm in love with is not in love with me. Maybe he is but the way he puts it is "I'm crazy about you." However, we have gone through ups and downs especially recently and its all his fault because he doesn't put the effort. But I've been reading and researching a lot about what to do, how to deal with men, how do men work, where do girls stand and what should they do in order for him to love you, etc. I have also come across people writing their stories about their loves and how they're older now and time is running out. Their stories have made me want to do research to find the best solution possible to make my relationship right now work so I don't have to go through with what they're going through. I'm 22 so I'm still young, but time flies and whether its my age or just me, I feel like I'm mature enough to not give up on something I recognize is worth it. A lot of people my age do give up and lack patience in their relationships including with someone they love. So I still want to believe there is only one love, thats what makes it special and now that I found him, I wanna make it work even if I go through some depressing moments. It's not gonna be easy but what makes me keep trying is the fact he hasn't said bye to me as much as I pushed him away or as many problems he's had with me. He'll point them out and thats it. Sometimes I'm like "okay this is for sure it, nice knowing you." But he doesn't say "its over I'm done." I'm not gonna give up on him when he hasn't given up on me. Like I said before, I only want one love so I don't have to go through almost like anxiety later on finding the one, especially, when I already found someone. I'm so happy I have him in my life and for giving me these real feelings I thought I'd never have.