<human>: So, like the title says I'm recently single.  This woman put up with me through a military deployment and when I had been depressed for a year and a half after returning home (neither of us knew I was depressed until recently).  

For those two and a half years she was not getting the emotional investment she needed and unfortunately, when I recovered from my depression it was too late, she tried to regain her feelings but could not even though the relationship was going amazing for that period of time.  

We decided to remain friends because of how close and comfortable we are with each other and have texted quite a bit and went out for food last night (we broke up last week).  

Anyway, I am just at a loss of what to do, I know the break up is a lot easier on her since she did not quite have those feelings anymore but I am completely lost- I had this week off from work and haven't wanted to do anything, it took me two days to leave the house and now all I want to do is sit around, drink alcohol and play fallout 4.   This void I am feeling is probably the worst I have ever felt emotionally and it is just crippling- the woman I wanted to marry is gone and there already is another guy.  

I knew about this other guy and I cannot blame her for developing feelings for him, she did not do anything she shoudln't while we were dating and she hasn't even told him that we have broken up yet, she is doing that tonight.  

I guess I am just looking for some advice to get over this, I don't want to be stuck, feeling nothing except a deep, deep sorrow.

Can you summarize the given text in a few sentences?
<bot>: Girlfriend broke up because I wasn't able to return emotional investment for some time but when I was able to, it was too late.  Feel a void in chest whose only emotion is deep sorrow- want assistance getting over it.