Hi OP, I was born in 84 if that's what your name means!
I am going through a very similar experience. Was with someone for 2 years, really close, living together most of it. We've been on some weird break for the past few months, brief check ins until about 4 weeks ago when we decided to meet up and work things out...we'd felt the same, missed each other immensely, could only love each other the way we do, etc. But I've only recently found out he's with someone else, he says it was 2 weeks after our 'break' ie his communication broke down ( I don't believe much of it).
He's been cold and I don't recognise this person anymore. But the memories and love for what we had are still there. I realise I'd had hope for being close again ( fuelled by his recent communication, pre new gf revelation!). I think in the past I've moved on so quickly, like my mind was able to power on through. But it seems my heart needs a lot of time to catch up and that's the strangest thing about this limbo period. Knowing its over, but still having hope. Its truly awful, so I'm sorry I am little help, just a reach out and a handhold. I dont tear up or randomly cry like I did when this first came out about 2 weeks ago. Insomnia is easing. Appetite is creeping back. I've honestly just tried to dig deep and listen to how I feel, not judge it, and each wave passes. Today I've decided to sign up to do an activity I've always wanted to try..I'm trying so hard to push myself into something new and fun, jusy for me. I dont feel like I'll ever truly be happy again, but I know that's not reality and everyday over the last few weeks has been different...overall its getting better. I think our minds do eventually let go and forget the hope for the life we'd planned. Its scary feeling alone. I've been doing a 10 minute meditation the past two mornings to get me some peace for the constant thinking. I've written down things I think and feel each day- it definitely lessens my thinking brain a bit. We might never make sense of it, but honestly each day is another day to learn. What things do you like doing, for you? Is there any hobbies you'd like to take up. Any places you've wanted to visit? Take care, show yourself compassion, feel your feelings and find ways to move everyday xx