How do I stop thinking I was a second choice?

My boyfriend and i have a one hour time difference as he lives in the uk and i live in germany. He used to have a crush on a mutual friend of ours, which i am fully chill with. The only thing is, he remembered to keep in mind the one hour time difference, and wait to congratulate her happy birthday at 00 for her. This on its own isn't a problem, i did the same thing and she's very important to us. What has me feeling butthurt and everything, is more that he forgot to congratulate me at 00 for me, while we were on call and everything today. It took me saying im going to sleep because i have to get ready early for my birthday tomorrow for him to even remember. I dont know if im overthinking this, but a small part of me still always worries that i was just a second choice, even despite how loving he is and how happy i usually am with him. I know for a fact he loves me, and i know i love him more than anything, and obviously im aware this isn't such a huge deal, but i still tend to worry. Can anyone give me advice on how to deal with this a bit?

How do I stop thinking I was a second choice?
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