Is it normal to be in love with someone who's 10 years older?

I've always been a girl who is more interested in guys who are older. Mostly two or three years age difference, but not more.

Four months ago I met this sportinstructor at the gym. My dad takes spinning classes there and because my parents are divorced I have my weekly visted to my dad and he thought it was fun if I joined him at the gym.

From the first moment I saw this instructor I had this soft tingle inside. Now, four months later, we're good friends and can talk about everything. He, unfortunately, has a girlfriend for five and half moths now, but he is going to study in another country for 3 months and she doesn't want to come with him and there relationship starts to show cracks everywhere.

I know that I'm really in love with him and sometimes I think he is also in love with me, because of the ways he looks at me or touches me, like squeezing my cheek softly or poking me in my belly.

Should I tell him I'm in love with him, before he leaves in three months??