Question for y'all 😐

I have a problem with abandonment. It's kinda a long story but post card version, it all stems back to my childhood & my father leaving & leaving again & leaving again. Because of that, I can be clingy as hell in relationships. My boyfriend doesn't mind it, or he says he doesn't. He doesn't get mad when I am. But I feel like I'm going crazy some times. I love him & I know he loves me but I can't talk to him every second of every day. I don't want to make him feel like he can't do anything. That bothers me because honestly, I don't care what he does, as long as his honest & doesnt fool around on me. Last night, there were some things going on & he was kinda busy doing his own thing. He was still texting though. But it's like he couldn't write back fast enough. & he's not big into fast response anyway....

What's some things I can do to help me relax and not over think the situations?