Starting from the idea that it’s a stupid question unless this guy was interested at having something with you, here, you have a chance to heal something that hurts and has an effect on you. You have to find a solution because you deserve to be happy.
Somehow, you have to overcome the negative feelings that produces the fact that you don’t have now a romantic partner.
It may seems nonsensical to you what I’m gonna tell you but as long as you more disengage the need for a partner, the higher possibilities you will have to built a healthy relation with a SO.

Why? Because you are gonna feel happier so you are gonna project this to the outside. You are gonna be able to choose well. You will see the other as someone who is gonna add. Someone whom share a nice adventure but you will always be yourself and be content with yourself.
Meanwhile, enjoy other kinds of love, from friends, neighbours, relatives, pets, new people to meet…

How to get it?
Doing activities you enjoy and enrich you, do little steps to attend to places where you can meet people (without any expectation a prior) only for the sake to share a little with them, fix your short-term goals to achieve and enjoy the time of satisfaction you get from getting these goals when you arrive home.
Practise self-care: Cosmetic, physical exercise, a look change,
Discover new things, new places.
If you have the opportunity and time to do something for your community, do it.
Have faith in you! This is the most important.