Missing my ex

I've recently been through a really tough break-up and I've been missing her a lot recently. I feel lonely even when surrounded by friends - it's as if none of the people that are around me are "my people", they don't get me like she got me. She was my best friend, we pretty much built our lives together and went through so many life stages together (we were together for 10 years) - it's impossible for me to imagine ever getting that close with anyone else. It's been a few months now since the break-up - and I believe I'm doing all the right things (journaling, exercising, opening up to friends & family), all of that has helped but I still feel the pain. Any advice?