<human>: Can you succinctly summarize the text in 1-3 sentences?

Hey Reddit. I'd like a little bit of advice, and hopefully some reassurance that I'm not alone.
I've been pretty average when it comes to dating and relationships. I've casually dated people, I've had a single, carefree phase, and I've been in a few substantial relationships. My longest relationship was a year and a half, when I was nineteen.
I've noticed a pattern when I do get into relationships: I get indifferent. I start wanting to explore my options, no matter how great the person I'm seeing is or how much chemistry we initially have. I know it hasn't been the guy's fault, because I've dated some incredible people who have good souls and are genuinely amazing. I just notice that I am most happy and excited during the initial flirting phase, and then I am equally as happy in the first few months of the relationship, and then I just get bored.
Am I just not ready to be in a relationship? Am I doomed to forever have flings? I hope there are other people who feel this way.
<bot>: I get bored easily, even if someone is perfect for me. any advice about how to overcome being excited only by the "chase"?