How to cope with fear of abandonment while trying to date?

I’ve befriended a guy who I really enjoy talking to. He helped me get through a slump by giving me encouragement and positive words. His words even helped to bring me out of what felt like severe depression. I was so grateful to him and he called me to talk just the same. The other day he went on a business trip and didn’t text me back for two days. I am not his girlfriend and had no right to anger but I was slowly losing all the positive energy. My feelings faded from positive to negative. I started to emotionally prepare for him to ghost me. I was embarrassed too because I took some days off next week to see him and I was worried he might stand me up. I just felt an overall sense of doubt and frustration. I Never used too be so hard pressed to get a text back. But when he texted me today to let me know that his last message hadn’t gone through because he was in an airport when he sent it and that he had been wondering why I hadn’t texted him unknowingly he had thought he texted me back. I instantly realized that I have developed a deep fear of abandonment from my last relationship that didn’t use to be here. I never felt so negative about not getting a text back but these last few days I noticed that my whole demeanor changed all because I was worried he was ghosting me
How to cope with fear of abandonment while trying to date?
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