Most Helpful Guy
Well boyo... You are right... Things are not easy in life and our feelings and sentiments makes us the most complex specie upon Earth. Once you break up from a RP that you've invested your time in, you will feel a "mess", in fact you will be a "mess"... Afraid, insecured and always wondering if they miss you, or even think about you... Worry not, because they do... They just won't say anything.
Anyway, I've been in that zone and I got out of it. I think the best advice that I could give would be - Dont try to replace somebody, with someone else - Replacing people won't solve your mess, in fact you will hurt the new people in your life too.
Try to invest time into yourself.. Either by a hobby, a new job, new clothes or cellphones, going out with friends or playing video games. You can try photography and this I recommend a lot... travel to unexplored zones of your city or places around and capture the best shots you can get... and when you feel ready have no worries to go out and flirt once again.
Most Helpful Girl
It's definitely hard to just "get over him". The best suggestion I have is to try and distract yourself. Find new hobbies that you enjoy and start thinking for yourself. The more you do it, you'll come to find that it'll help you more and more. You'll eventually get to a point where he won't be on your mind anymore. But you really have to be serious about wanting to get over it, because if you still have him in your contacts or on any social media.. it will be THAT much harder to move on from him.