French kissing with mono?

So, I was french kissing my boyfriend today and afterwards he told me he just got over mononucleosis last month. How likely is it that I will get it? How bad is it? What does it do to you?
Updates
+1 y
Also wondering, if I get mono how do I explain it to my parents since it's called the "kissing disease." I don't really want to tell them that I've been kissing my boyfriend, let alone french kissing him.
French kissing with mono?
Post Opinion