<human>: Could you distill the essence of the text into 1-3 sentences?

I broke up with my ex about a year and a half ago, I'm over her, and very much in love with my current girlfriend. After my ex I went on a bit of a spree, seeing a couple of girls, none of which I developed feelings for, although they did for me. I did "try" to see if I just wasn't realizing that I had feelings for them, but honestly there was no chemistry. I enjoyed that for a while because I was enjoying someone's company (hanging out, having sex) without the fear or going through the pain I did prior in my first relationship. I know now that the spree was a bit childish, and I regret continuing with those girls although I didn't feel anything, but I've definitely grown, and it's brought me to a relationship where I'm feeling feelings I've never felt - I'm so relieved I actually am feeling these things again, and in even greater magnitude. 

My issue is this; my first relationship, I wasn't scared of living through the end of it because I didn't know what heartbreak was, I had no context and thus no fear of an end. Currently, I'm so very much in love, I have a consistent fear of reliving the pain that I did in the past when my last relationship ended, and even more so because given how in love I am currently, I'm afraid the sadness of the heartbreak will also be greater in magnitude as well.

Is this normal? I know i'm being too much of a pessimist, I really don't think this relationship is going to end anytime soon, but I too frequently think in worst case scenario
<bot>: how do I get rid of this fear of this eventual impending doom when the impending doom is honestly no where in sight?