How to show interest without coming on too strong?

My problem when it comes to dating is: I fall too fast. I've known this guy for a couple of weeks, went on two dates, had a good time. But the minute I realize I'm into him, I want to take a step back because I don't want to come on too strong, because having feelings for someone you just met is a bit too much (or so I think). So then I take a step back, I don't wanna take too much initiative, but I want him to know I'm interested. I asked to meet up once, but he couldn't make it, I try to flirt but online/through text isn't that easy for me. So any advice? And how to know if he's not interested at all? Because I feel like he was into me, He sometimes texts me goodnight, but other times he doesn't. Then I start over thinking things, which I shouldn't do (I know, but easier said than done). I've been out of the dating scene for a year and I don't know how to let a guy notice I'm interested without coming on too strong or know if he's into me too...

(maybe some more info about "us": went on two dates, text almost every day, either he texts me or I text him, he teases me but not a lot, won me a teddybear two weeks ago, sometimes texts me goodnight, he told me in the beginning that he feels we can talk well)
How to show interest without coming on too strong?
Post Opinion