Limerence; unhealthy emotional dependence

I've been chatting with this guy for 1-2 months. Because of this, i've been infatuated with him. I think about him constantly and daydream about him. I'm bothered when he takes long hours to reply. Like, today. He hasn't responded to me for more than half the day and i've been constantly checking my phone. However, i don't even know if i like him or if it's just limerence; falling in love with the idea of him/love. 

There are times when i think i like someone, but when i think about us dating, or when they tell me they like me, i end up losing interest. Perhaps because i'm emotionally unavailable? It's exhausting though to feel this way. I'm unhealthily emotionally dependent on someone/the idea of someone. This isn't the first time i've experienced this. When i'm infatuated with someone, i block other people out/talk to them less. All i want to do is talk to them. My mood depends on how they respond to me. I constantly daydream about them and fantasize; making up scenarios.

I try to do other things, but in the end i always end up thinking, daydreaming, or wondering why he hasn't texted me back. It's extremely tiring. I just want to be normal, and build a healthy emotional connection with someone. 

How do i stop romanticizing the idea of someone? How do i build a healthy emotional connection without dependence with someone? I think i know how. But trying is really hard.