Am I (22M) overthinking this girl, or is she (21F) actually trying to hint at something?

I (22M) have been talking to a girl (21F) every day for the past few weeks. We used to know each other from high school, but years ago, she told me she only saw me as a friend after I made an awkward move. We stopped talking for a long time, then recently reconnected after a random conversation and have become much closer.

Since then, she's done things that make me wonder if she's interested:

She got jealous when I spent time with another girl.

She told me she missed me.

She changed our chat theme to one she knows I love and told me, "Look 🥺."

She sends me relationship-themed reels pretty often.

She teases me for overthinking and even jokes that my brain needs a software update.

When I suggested going out, even if our friends didn't come, she replied, "Yeah, let's go."

On the other hand, we had a conversation where she repeatedly joked, "I don't love you," while also bringing up another girl I used to like and saying I treated that girl differently. She also said I don't understand relationships and that I'm too logical.

Recently, the hints have slowed down, and for the last couple of days, we've mostly just exchanged reels with less conversation. Now I'm wondering if she gave up because I haven't confessed anything.

The reason I haven't confessed is that I genuinely wasn't sure about my feelings at first. I didn't want to tell someone I liked them unless I truly meant it. Now I do think I like her, but I'm waiting for the right moment instead of forcing it.

My questions are:

Am I overthinking all of this?

Does it sound like she's interested, or am I reading too much into friendly behavior?

If you were in my position, would you keep letting things develop naturally, or would you tell her how you feel soon?