Crushing on a girl who I do belive is the one for me, how can I build that interest?

This is a weird one honestly

Few months ago after we met things got heated up to the point where we confessed to eachother that we liked eachother, but we didn't date as she then got very much into another guy she had something with before that didn't want anything to do with her.

We kept as friends but it's a weird friendship where sometimes it feels like we are friends but not, she's been open about having ADHD so after I introduced her to the friend group she immediately started to talk to them a lot more, often switching back and forth being very open and friendly to closed off and dismissive. She has said that I am her type, but I think the interest just isn't there currently.

I asked a friend last week about what I should do but we just in fairness don't interact that much, she told me that she was feeling pretty lonely lately where my name was brought up and she said that she's not that "into" me, which is fine as again we don't speak all that often, but did punch me in the gut a bit as again I think the interest just isn't there currently.

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In a way I do think one reason she's kept a wide distance from me is to keep me as a option when it comes to dating, about December way she asked to go on a walk with me where she joked about us having fun as a situationship-type deal go from there but we didn't do it because of some separate issue between us that's been cleared up
Crushing on a girl who I do belive is the one for me, how can I build that interest?
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