First of all, however this relationship ended - you cannot sweep it under the rug. You need to process the grief. If you have means at all - seek professional help.

Second, video games, social media, substances - unless you are absolutely sure you can control it - is a way to the abyss. Don’t go there.

Third, learn to appreciate the advantages of being in the state you are. When I lived alone - I traveled to some beautiful but risky places where I would not take my mate. Did some martial arts because nobody would bat an eye if I got bruised.

Fourth - decide what is right for you and think hard about the life you want to live. Any popular non fiction book is necessarily not very deep but you can start with “Designing your life”.

HTH