You need to understand it's not possible to fuck this up by not texting her. It's a choice that involves zero risk.
When a woman feels high attraction or interest in a man and fears he is backing away, the first thing she'll do is reach out to reel him back in. If she doesn't, it's because her interest/attraction was barely palpable and you didn't really have a chance in the first place.
You are not going to build attraction with this woman by checking in and letting her know she's on your mind - that's not how it works. Attraction is built when she's forced to wonder about you and take action. Why hasn't he texted me? Did he meet someone else? Is he dead? Did he win the lotto? Is he fucking my sister?
If she's into you, her mind will start running wild as it combs through all the possible ways you're spending your time. As you begin taking up more and more of her headspace, you'll simultaneously be demonstrating the fact you don't need the reassurance of her contact, and have a life of your own to tend to while she's away. These are the traits that drop panties.
You'll be creating attraction while sitting back doing nothing, because her mind will do all the work for you.
This girl hasn't jumped your dick after 3 dates because she has no fear of loss. She knows exactly how much you like her, and subsequently hasn't felt the need to use sex as a tool to keep you on her track, nor has she felt enough attraction to rip your clothes off out of pure lust.
You aren't completely dead yet, but this needs to change.
Let her experience the sensation of wanting to contact you. Let her wonder about what you're doing while she's away. Give her the space to miss you.
If she digs you, she'll try to make plans upon her return. Set something up and use that momentum to escalate things physically. At this juncture it's essential you sexualize the dynamic.
And dude, focus on fixing your insecurities. They will will eventually manifest themselves in the form of jealousy, neediness, and myriad of other ways that send women running. They're delusions, not truths, and they can be expelled.