Now this might seem a little bit weird but After I have sex, I just want to get away from my girl friend. I’ve never been really sure why that was. Does anyone else have this?
Sometimes I get that. I've also heard about postcoital tristesse or dysphoria. I'm not sure if you meant that you want to get away because you're feeling sad, or if you're just feeling disinterested?
I always relayed the idea of smash and dash as a way of interpreting that you may be attracted to her, but you're truly not in love with whoever you are with (whether this fact is known consciously or subconsciously).
Love is understanding and above all, companionship. This is not exemplified through smash and dash, regardless of any condition.
I understand stepping outside, grabbing a drink, etc., and then returning. If you truly are having sex then dipping out (even considering dipping out) on a regular basis, thats very inconsiderate and rude. You shouldn't do this, even if you have the desire to. A little compassion and self control/reflection should help shed light on this fact.
Remember alexithymia is a condition, not an excuse. We can be very functional people, but everyone can use improvement. For us, we should focus on improving our emotional identities.