I'm about to break up my 3 months old relationship

I'm in my mid 20s while my girlfriend is two years older than I am but that's not the problem, we've known each other for years before we started dating 3 months ago .she already wants us to get serious and wants to visit my sister soon. I know she's a wife material but the issue I'm not so attracted to her, she's ok, not ugly but when I look at her I don't get that sexual kind of attraction towards her unlike other girls. I like her but I don't love her.

I've been with her because she's got a good character and not the slay queen kind of girl. Now that I'm about to break up with her I feel I'm about to lose a great girl, at the same time, something tells me if I keep dating her, I could cheat on her in d nearest future(although I'm not the cheating type)

Which brings me to the question, how important is physical attraction.. would appreciate some advice on what to do