i can't stop thinking about my ex?

we hit it off so well for 3 months and then we both knew she was going into the military, we had our first argument ever, afterwards i apologized but she was distant, the day before she left into the army, we chatted and she said she needed someone who would support her career choice and i needed someone who would be there for me, our personalities are to differn't, those were her words, 6 months later she gets into a relationship with some guy she met in the army, they break up 6 months later, it's been well over a year, before we broke up she said i was really sweet on top of all the other stuff i said previously, most of you probably don't know what snapchat is but it's a form of social media, i deleted mine, my ex never viewed them, a function allows me to see who has viewed them, i made a new snapchat and posted something on facebook saying add me if you want, she added me even though she never looks at my snapchat posts, and she for the first time in well over a year viewed my post on snapchat, she broke up with the other guy like 6 months ago, i never stopped caring for her, saw her like 3 times since we broke up in the hallways of our college, all we did we exchange a wave and smile, sometimes a "hi" i know 100% she is physically really into me, and at one point mentally but she puts up a huge wall with her feelings, i want her as a partner in life, not that i'm not sexually attracted to her but i care on a deeper level for her, we shared a lot with each other, i just don't know if i should do something or not, i know she thinks well of me but i'm afraid to make a move because like i said she puts up a huge wall between her and her relationships, if i contact her out of the blue she might ignore it which will really, really hurt me but i would literally die for her and i know that sounds creepy for someone who has only dated another for 3 months but, i can't help how i feel, i have been able to distract myself through crazy laborious work and other issues but, maybe it's because she was my first girlfriend due to extreme social anxiety and just being so moral in life and turning down every chance at sex i could have, but she means a lot to me, i didn't talk to her for over a year because we broke up and she found new love... i was sad but happy for her, i'm so sincere and afraid she will think badly of me if i make a move now

Usually, your ex is your ex for a reason. I very rarely think it is a good idea to go back to an ex. However, it CAN work out under certain circumstances. I guess the first thing you have to ask yourself is what has changed? For you or for her? From what you say, the biggest issue was her military career. She wants somebody who will support her career choice, but you want somebody who can be there for you/with you. Neither of you is wrong there, but that is definitely a pretty major difference. Has that changed? I find that unlikely, and if it has not changed, it is likely to become a problem again. Even if you think you can live with it, in time it will just become too hard to deal with, and if it has been longer at that point, that will only make it even more difficult and painful.

If you truly do feel the situation may have changed enough that it could no longer be a problem, then maybe it is worth going for it if you feel it could work. In that case, you aren't going to know if you don't give it a chance. Yes, she may reject the idea and it would likely hurt you very much. But, it is always better to know than to always wonder what if.

Still, typically my advice is not to go back to an ex. Here, that would again be my personal advice, but if you truly do think it could work this time, then you have to do what is right for you.

Good luck to you either way.