Why do I avoid the women that I actually like?

I have this problem where when I start to like a girl I avoid her and act like I'm very disinterested in her. I don't want to avoid girls. In fact a lot of the time, I look forward to seeing the girls I like and want to get to know them better. I am someone who has dated before and I know from past experience that I make a good boyfriend.

For claritys sake, I have Aspergers Syndrome and have struggled with anxiety in the past, but as I've grown older I've found a lot of different workarounds for these difficulties. Im also a Christian and have had a lot of traditional relationship stuff put in my head from a young age. Additionally, I'm above average as far as my appearance and health go so I'm confident in these areas. Right now, I'm 25 years old.

Why do I act so contrary towards girls that I like? Does anyone have any tips on how I can overcome this?