Youll be OK...
my wife & I seperated after 10 yrs, my son was 3 and daughter was 1.5 at the time..
I still saw them during the week and every other weekend religiously..
I met someone and had another son..and connection became natural since I had my kids so much..my young son and daughter are very close.
Now my son is 17,my daughter is 13, and young son is 10...and everything is great theyre here this weekend.....they just cost more when theyre older (IPAD's,PS3,laptops)
And I can still give a rats ass about my ex!! So youll forget about yours and find someone better like I did
Good luck!