Is my teacher (40sM) romantically interested in me (17f)?

Before I continue, I must provide a disclaimer. There has been no physical contact between myself and my teacher. And he has made no direct statements about any romantic interests. I am simply trying to see if I’m reading too much into things or rather correctly reading between subtext. I am absolutely open to whatever answer is given with the most logic, thank you.

So, to begin, I had a crush on this teacher since before I took his class. Then, when I did, i worked extra hard to get his attention w it’s my good work. This paid off and he eventually suggested that I skip the next course level and study for the advanced level with him during the summer. By this time I had already been coming to school during breaks and teacher work days to work on the subject with him.

So fast forward to the summer I did the work to skip the other level to go to the advanced. During this time he had given me his number and for a while we texted only about the subject, but I’ll come back to this later.

In an email once he made a typo that included some sexual suggestion. But this could have been a true mistake. He would also ask me if I knew what words like “promiscuous” meant whilst grinning at me. Could also have been educational.

We continued messaging, and then he told me he was leaving to teach elsewhere. I came to school to work on the subject with him that summer as well. Then finally once the new school year started that year, and he was already gone, we began messaging about more personal things, not on the topic of school. He would often say he was thinking of me or that he wished I could have gone with him. However I did send equally “suggestive messages” sending book quotes that reminded me of him.

He has been suggesting that I apply to colleges near where he lives. I guess that’s when I began questioning things. Now he even had told me that he wanted to come to my graduation and “take me to dinner” afterwards, and has offered to pay for a prom dress, both of which I subtly declined. But I admit I haven’t totally shut down the possibility of romantic aspects directly to him. It’s just that sometimes I feel like he knows and understands me so well and I even desire him and other times, it’s so bad I feel whiplash, because I become disgusted by him and the idea that any man might be interested in my younger sister with a similar age gap, it just feels morally wrong.

Even more recently, he messaged me saying he was bored or something and somehow we started talking about movies. And he said he missed me and thought of me when watching Lolita (because I had the movie poster as my phone wallpaper when he still taught me in person). He used terms of endearment and referred to me as “his…” you know those sort of statements. Anyway, I’ve been ignoring him since, which has only been a few days, because I just can’t reconcile with the age difference and I feel like if I told anyone I know, even though nothing has really happened, they would be weirded out. So am I thinking about it too deeply, reading into it too much, or is it really weird/wrong for this sort of relationship to persist?