I feel like this relationship has just sucked the life out of me leaving me used and emotionally abused
You know that if you are foolish enough to believe the no doubt lavish promises of change he'll make in order to get his feet back under your table, it won't be long before he sucks all the joy out of your life again.
It's only a week since he packed his knotted handkerchief and departed of his own volition, after causing needless upset to your dc and getting you to drive him to the station, and you're still adjusting to his absence.
Early day, Lm - give it another couple of weeks and you'll realise that you don't need a man to define you and your certainly don't need a 'dp' who's not worthy of the title and, more especially, one who sounds as if he's yet to get divorced.
Avoid 'couply' events until you can feel amused by sorry for those who put on an act for such occasions and can't wait for them to end so that you can go home, kick your shoes off, pour yourself a 
and stretch out in your own bed without a snoring farting body next to you.
What have you done to get back in touch with those friends and family members you've not had time for because you felt obliged to dance attendance on a selfish twat who has no respect for you and no compunction about upsetting your dc?
He may have rapidly been rebuffed by the ow he was hoping would be stupid enough to welcome him with open arms discovered that the grass isn't greener on the other side, but from where I'm sitting your patch of lawn is looking a lot healthier now he's not on it.
The future's waiting for you - make it a good one for you and your dc.