Why do guys always wanna play the "Let's be friends" card?

Translation: "I like you a lot, but I still have a lot of vaginas to sample. I mean... what if we get serious? Think of all the vaginas I could have had."

Honestly with me it's because I had a lot history of lashing out when I wasn't the one to leave the other party, and they left me instead.

So it started to become something of a goal to actually be able to maintain a friendship when a girl dumped me and hurt me in the process.

I wanted to change, and continuing to talk to them helped convince me I really was changing my vindictive patterns.

In hopes that one day they'll get lucky, and score with said friend.

Can i use this card?

Safe route to get pussy while maintaining self respect

what do you want yourself?

Emotional blackmailing I guess.

It's safer that way. Nothing personal... I assure you.

They want to be single

They don't. It's similar to solitaire. You keep on playing until the right card comes along.