Questions: Relationships

This man is 23 years old in college working towards his PhD. He's really hot and has abs. But, you figure out, he has messed with a lot of your friends and used them all for sex. One of your friends tried to hookup with him but got denied and he called her ugly and blocked her. He uses a lot of women for sex (specifically the ones looking for relationships); the ones looking for hookups, he rejects all of them. He might get into a relationship with some of the girls with the intention of cheating on them or just ending relationship once he's tired of it.

This seems like an absolutely monumental task and like someone's one the other side of the door with all their weight on it to keep it closed. Asking what I'm doing wrong has never resulted in a helpful answer.

So let me ask you this: what are you doing right? How are you able to go from person to person with ease or at least with some effort?

For guys specifically: do you sometimes feel invisible and have to do something specific to uncloak in a way?

A girl I was wanting to marry is marrying someone else on April 22. I am having a really hard time coping with it.

She never had a male friend before she met me. She never had a boyfriend, first love, first kiss, and was still a virgin. I thought I found the one at one point. We carried an online thing for several months until I met her for the first time in person, and she discovered I wasn't her type. She ended up meeting some other guy shortly after who she fell in love with and they are getting married in like 2 weeks.

Meanwhile, I am still single with hardly any friends and live on my own.

I wonder if I will ever find a other girl like her, one without a romantic past.