Christians, is my heart being deceitful in this situation?

Recently, I've been thinking about this boy in church that's absolutely kind and handsome. I forgot to get his number, but I really can't wait until Sunday when I see him again.

However, I am very worried I could be obsessing over someone else's boyfriend or that he would be weirded out by the fact I think he's adorable. God says our hearts are evil because they have been tainted by sin, and I can't help but feel guilty for this crush. Is it wrong to be thinking about him so much and getting excited? I would really hate to have such feelings for a taken man- and if these feelings are wrong, how can I settle myself down and act normal again?
Updates
3 mo
So update: I got his number, but we barely talk at all and I think I just want to be friends with him. He seems nice and handsome, but I definitely think just diving right in would be... Foolish. Plus, he's busy with college, so I doubt he'll be open to anything as of now anyways. Thank you for your advice, it helped me build my confidence, and I think that's what mattered most :))
Christians, is my heart being deceitful in this situation?
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