If you think there are loads of things holding you back, make a list and think realistically why you can't do them on your own. Resist things which link you to your partner which is very easy to do.
For example, when I was thinking about moving on (currently still live with ex) I'd think (what I now see as daft things) like how I'd miss Sky or habing access to a car or having someone around and living so close to work etc...
When I think about them logically, many of them are rubbish as I can move where I want (have been checking out properties), learn to drive (booked my theory test and enquired about driving lessons last week), can get Sky myself etc...
I miss intimacy but it's not like I won't have another, probably better, relationship.
I've also been neglecting my social life and creative side so have got my art materials out and planning some photography trips, am going to join a local choir, maybe some art classes and get involved with voluntary and charity work again.
I'm now excited about moving on and don't have anywhere near enough time or headspace to lament about a former relationship :)
One thing though, don't do it as a "sod you" to him, do things for you, even if that means keeping it to yourself or telling friends rather than him.
I hope you find happiness :) x