<human>: Hi Reddit, this is literally my first time posting so please go easy on me 

Okay my story is I've always been a long term kind of guy, always liked being in a relationship and never even thought about other people.
But last year my ex ex dumped me after 20 months, I know not even that long of a time... 
Anyway since that point in my life I've dated lots of girls, been in a couple of relationships and had one night stands, and each time I've always been thinking of others whist being with these girls. 

The problem is I can't seem to help myself comparing the feelings I get with each girl to the feeling I had with the ex ex... And it just isn't the same :'( 

So basically, why?

Give me a shortened version of the text
<bot>: Got dumped by the girl I thought was the one, now I've become a slut and I don't like it. What