My feelings are confusing can you give me clarity please and advice?

So I have always loved a boy from school since I was 14 years old I always knew I had a connection with him since I started secondary but I forgot about him for a while until I turned 13 and since then never forgot about him fully. 10 years almost it’s been we haven’t seen each other so I have now started to crush on another man and I like looking at the new crushes pictures and videos but what confuses me is when I am thinking about my new crush the boy I loved from school pops into my head out of no where when I’m not even comparing them when I’m thinking about my new crush sexually the boy from school I loved automatically comes into my head and I see his face why is this happening? Also when I am thinking about marriage with my new Crush my heart and mind makes me feel like something is missing and I feel I won’t be happy with my new crush if we ever decide to get married I feel He won’t be enough for me why do I feel like this when I do really like my new crush but my past lover pops into my head why is this happening?
My feelings are confusing can you give me clarity please and advice?
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