Why do I feel a both strong emotional and sexual attraction to my boyfriend?

Honestly I don't know were to start , me and my boyfriend have been together for 3 years and 6 months were in a long distance relationship and we met in middle school and have been knowing each other since then , I've been in a relationship before but I don't count it as one because it was a middle school relationship with a boy who did more than break my heart but now that I'm actually in a real relationship with my current boyfriend I've become more clingy and mentally attached and sexually aroused by him to the point it sometimes scares /disgust me.. because I don't understand why I'm so happy and turned on by a another person.. the comfort , happiness and wet dreams I get because of him are unmatched. and its not like i should be surprised about how much i truly love him... to the point i both dream and day dream about him constantly... It's just crazy to think about..

Why do I feel a both strong emotional and sexual attraction to my boyfriend?
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