Usual girl problems...

sex without the emotional connection is just like eating food when you aren't hungry. it usually doesn't help anything. I don't know if you got back together with your old girlfriend it would change anything. maybe you just got so hurt by your first relationship that you never healed and never tried to connect on the same level with another girl. i hope this helped

When your really in love with someone, being with other people won't help heal those wounds, it will only make it worse and make you feel worse! The best way to deal with your situation is letting time heal your wounds!

You were probably on the rebound when you had these one night stands and affairs and stuff. With one night stands there is no emotion involved and the affairs was probably just to get a thrill out of life. With the first girl there was some sort of foundation where you gave and recieved love, and because there was a strong attraction between you two which you have not had with the rest of these 'relationship' then she is obviously the one that will leave a mark in your heart

You are having sex with all those girls, possibly to get over this first girl. The reason sex isn't maybe making you feel better is because you are not doing it because its the right moment or because you like the girl in the first place, you are doing it just because it is something to do so no emoton is really involved in it

to answer your question, the reason why, when you are depressed and you begin to thing of the first girl, is because she was your first true love, and your mind will never be able to forget her.

Well a one night stand isnt a relationship, thats why you dont feel fufilled, sex is sex a relationship is different and should be more than just sex in my opinion if thats how it was with you. Try starting a new relationship.

Hey i have that same dillema and i think i still love that girl but its too far gone what the hell can we do its life i guess so try to be open and meet girls at different places that you wouldnt normally i have screwed a ton but this one girl that we split i still miss her i say her name some times and think of her face and smile i loved her man now all these others cant compare i guess its my own fault

Yes the Ritalin could actually be causing
you to experience what they call manic depression and / or Bipolar disorder

With Manic phases you do have a sex drive
increase and also, Ritalin is a stimulate
so yes its possible to increase your sex drive , So there is the two things it could be

Hoooo boy! Did dat firs' Misseh make you good pancakes? Did she use bress' milk? Did she let yo' tinkle on her purdy face?
If the anssah be YES den she be like ol' Jemima. If the anssah be NO den yo's gots to pee on her face.

"maybe you just got so hurt by your first relationship that you never healed and never tried to connect on the same level with another girl"

yeah that's what it sounds like it might be.