<human>: We had a very happy relationship of 1.5 years - always honest with one another, supportive, etc. 

Sometimes we would have doubts as to whether or not we would be happier dating someone else, but we shared those doubts and knew overall that we were happy together. I don't think this is abnormal in any relationship, though.

Now, I don't believe in "The One" - I think there are many people we can be happy with. And I have always been able to picture a future with him. He, on the other hand, would often tell me he couldn't see a future with me ("yet") and was "waiting for a sign". 

So he broke up with me, letting me know that he wasn't sure if he was making a terrible mistake or not - but he had to make it to find out. And I can respect that.

However, I still love him a lot, and miss him. I know our relationship helped us both grow as people, and made us happier. Since we broke up just because of "doubt" and not a concrete reason (incompatibility, cheating, etc.) it's really hard for me to not fantasize getting back together with him someday.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: don't want to wait for him, but it's so easy to picture a future with him. Does anyone have any advice?