There is nothing wrong with you LL, but whatever your doing after meeting these guys isn't working.

Look I don't care if someone sleeps with someone on the first date, or waits till they are married. However the chances are if you sleep together early on its just viewed as a bit of fun.

I wrote recently on another post, that I had listened to a guy talk about on line dating and how they viewed it more as a take away menu than the basis for a ltr.
I also asked if you met a complete stranger, would you be inclined to sleep with them 6-24 hrs later. If not, why do this with ppl online.

Texting or emailing teaches us nothing except what they want us to see.
If your dating, and you have only been on 3 dates that's probably 6-12'hrs real time.
I don't count the time spent online.
And this is why...

My current partner and I were gaming buddies for 3 years. If you had asked me I would have said I knew him inside out.
We had never met, but we were pretty tight.

After nearly 3 years he happened to be in town, I asked if he wanted to meet up.
He said yes, but he needed to tell me something first.
He then informed me he had served a 7 year sentence and then explained what for.

There was no way I would have known, or could have guessed.

My biggest piece of advice is just don't put out. If they are still around after 6/7 months there is a better chance for the long term.
If they leave before hand, you know what they were after.

Your a great person LL, don't measure your self worth against those who have none. It's not worth it.