I (32M) like this cute and fun girl (F28) and I'm afraid of being cheated because she's too cool

So I've been seeing this girl that's very outgoing. She has tons of friends in Facebook and IG, that like her pictures and so on.

I love her personality, she's fun to hang with, smart and we can talk about anything. However, these very qualities make her so attractive I'm always afraid of being cheated.

I've dated shy and introvert girls in the past but the lack of conversation kind of let me down and depressed.

What should I do? I'm extrovert and fun too, but an average looking guy and can't improve much.

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TL;DR: girl is too cute and have contact with lots of men; I'm afraid she'll cheat on me or simply lose interest over time