<human>: Can you summarize the given text in a few sentences?

I've only been in one serious relationship all my life. It lasted 4 years, but came to an end earlier this year (8 months ago). My ex and I were living together then and we'd gotten to the point where we were completely comfortable with each other. I would even go as far to say I thought he was the one I'd be settling down with. Unfortunately, something went wrong.

I've dabbled in a few new relationships recently, but none that have lasted very long. I find that the main issue is that I'll often compare new people to my ex. If they don't understand me as well as he did or don't share the same sense of humor, I'm immediately put off. If I'm not completely impressed on the first date, I just don't want to continue. I realize how unfair this is because it was probably the same with my ex when we first started dating. It took 4 years for us to become the way we did.

My problem is, I just want to have someone to be close with again, without having to put in years of work. I'm extremely hesitant because I don't want dedicate myself that much to someone and have it not work out again.
<bot>: I've only been in one long term relationship in my life and I've forgotten how it's like to date new people. Are there any good tips on starting over? Or do I still need more time to get over my ex?