Feel like Im second best

Hi, I need some advice about my boyfriend, but I dont know if its all in my head so I dont want to discuss it with my friends incase I seem crazy. Basically Ive been with my boyfriend for about 8months, and on the whole its great, we have fun together and Im always really happy with him. The problem is his ex girlfriend, he was only with her for about 3months and split up with her not too long before we started dating. However, hes a very laid back person with relationships and likes to take his time getting to know a person, but he didnt with her, they jumped into a very serious loved up relationship very fast and it ended just as quickly. When Ive asked why it ended he wont tell me, he says its personal to them and he doesnt want to talk about it. This worries me, as hes quite open with other things and I feel like theres a big reason why theyre not together, he claims im overthinking it but I feel like im the second option now, as though he wont tell me because hes not over it, or because theyre not together because they cant be, not because they dont want to be. Also when talking the other day, I asked what the most romantic thing hed ever done was, it was for her. Hes never really been romantic to me at all and now I feel even more like second best, clearly his feelings for me arent as serious as they were for her in such a short space of time. He also says his biggest regret was something to do with the way he acted with something with her. Im worried his biggest regret is what caused them to split up and he wishes they were together. I know this is rambling and long, but Im not usually a jealous person, I trust he wouldnt cheat but Im scared im second best and that given the chance, hed rather be with her. Its making me wonder if I can handle our relationship with this hanging over my head, especially since he knows how much it upsets me and still wont talk about it. Am I overthinking things?

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