Some encouraging stories please

Anyone who was in a long term relationship end and moved on to find someone else? My 7 year relationship just ended and we had a baby together and I’m feeling like I’ll be so lonely :( and alone forever... that I’ll never get over him. That he will move on and find someone else and I will die inside. I’m 21 with a 3 month old & feel like I won’t ever get out to meet someone, no one will want a single mom... and honestly I only want my ex I truly thought we were soulmates.