I was with a girl for a long time and at some point I probably wasn't providing the spark that was there in the early part of the relationship because this girl decided that it would be best to part ways. This was 4 months ago now, all round I'm fine about it mostly and I do miss her and so on, but I have an extremely lonely feeling the whole time, I feel empty regardless of who I Am with. I think about her a lot and it just makes my day worse and worse. It was suggested to me to take up a new hobby or get more active so I have started going for runs, I find them worse because it gives me the freedom to think while I'm out and I think about her. What do I need to do to move on, the feeling of loneliness is driving me towards depression.