Just because I had an affair with you doesn't mean I like you!

我和你发生关系并不代表我喜欢你!

这句话，真拧吧,.... 来分析一下

Just because 的意思是:虽然...但是....
一般的用法是Just because ...doesn’t mean

例子:

Just because I’m married doesn’t mean that I don’t want to see my old friends anymore.

虽然我结婚了，但这并不意味着我就不再想见老朋友

affair :风流韵事