I feel the same, man, heart stops and so on, but it's also so much similar what I feel for her and what you feel with your ex one. Memories just are memories for me, but there are times that I'm at bed and I just think "Damn! I screw up everything... I mean, I shouldn't have been a dick!". There are also times that I cry thinking that I've hurt her feelings and I feel guilty about it, besides, I may not love her anymore, but at the same time I don't know what I would do if she says "Okay, I still love you". You know, it's kind hard to guess how I would react. Also, I feel that I won't love anyone for 2, 3 or even 4 years, so, it makes me sad knowing that she already, probably, has been trough all and got over me and I can destroy her life saying "I might still love you because, you know, my hearts does this, my stomach that and so on". Anyway, we both feel guilty about it and if we could back in the time and not be a dick, we would. Hopefully, we will get over through it and just find a new love in our lifes. Just to add, she was my first love and girlfriend too, we broke up about 4 months ago, she started dating another in about 2 months ago and we started talking again (but not that much as I said earlier) less than a month, actually, when we would do 1 year together if I hasn't been selfish: 24/05 or 05/24, how much you like.