There's this girl I'm seeing and I really enjoy her company, but not to the point of wanting to have a serious relationship with her
I tried seeing other girls so I could find a potential relationship, but it always goes nowhere
This girl really really likes me, but I don't like her to the same degree, despite enjoying her company and spending time with her
I like sex with her, but she doesn't make me often spontaneously horny and she basically is the one who initiates sex when we have it

Should I just make her my gf so I don't just die alone with no gf (I'm 29), despite me not being ultra ultra into her?