People who have gotten back together with ex’s and it worked, how did you make it possible?

Basically just looking for clarity. Me (20F) and my ex bf (20M) have been back in contact for a few weeks now and it’s been going well. We were together for almost two years. We were split up for only a few months. I really want to hear about people’s experiences of having relationships with past partners and how you get past the hurt in order to trust and love someone again.