<human>: Give me the gist of the text in a nutshell

EDIT: I know I used "is" instead of "are" in the title. Realized after the fact I didn't correct it.

I spent... 4 years without even touching a girl in any way romantic. Last time I tried dating, I was burned that badly by manipulative women. Now I'm trying again in a new city 500 miles away. 
Well. Since then, I have managed to have "flings" with 7 women in only 5 months. This is absolutely insane for me in the first place, because I never had a single date before this. And even now there aren't dates. Things are weird.

Every girl -except for one- has had a boyfriend. Every single one. I'm not trying to date/bang/get with women who are in relationships. I just find out after the fact they "forget" to tell me they're in a relationship, or they are polyamourous. 

Disclaimer: first girl was just using me to get over a breakup and moved to another state shortly after.

Now. Polyamourous relationships. I've not met a girl who was really "polyamorous". the 3 girls that told me that, ended up just using me to fill the void left by a bad boyfriend, for second plans when their main boyfriend bailed on them, or were too busy and they were horny.

I am tired of this, honestly. I'm getting ready to go another long time before I feel like asking women for their numbers, or to do something after whatever event we meet at. 

I don't give a damn really about sex. I just want a relationship. Someone I can grow and share all the stuff I'm doing with.

So do I just have bad luck, or is this just how the age group (19-25) is?
<bot>: For the age group (19-25), is cheating really common, and is polyamory just an excuse to cheat?