How do i stop having a crush

I feel so bad. I've been with my husband for almost 8 years, married for 1.

I love him. I cannot imagine my life without him. We had a cancer scare a while ago and there was no doubt in my mind i would look after him. I've seen my dad die of the same type of cancer, yet not a second of doubt i would go through it with him.

Now, we have a neighbour and I have such a crush on him. I get nervous around him, I think about him, can barely look at him without getting weak knees. I actively avoid him because of how I feel. I want this to stop, but I don't know how to make it stop.

Any advice?