Is it ok to be unsure about moving in with my boyfriend if he isn't giving me any valid reason nor timeframe?

We've been dating for 2 years and he just recently asked me to move in with him. The issue is he wouldn't give me a real valid reason other than spending more time together and nothing else. I asked him for a timeframe, if it's going to be 1 year at most as I don't want my time and years wasted and he said along the lines of ''I don't know, we'll just see how it goes''. I'm having my doubts. I didn't like that answer.

I asked him more questions if this moving in is because he sees a future with me and plans on having kids. I've noticed he tried to avoid my obvious question and end up saying ''Maybe, we'll just take it step by step and see how things goes''. Once again, I didn't like that answer either and I feel I'm going to waste my time if I move in with him. I've heard too many horror stories of women that did that and had to break up after being still a girlfriend after 8 years and no children. My own older sister was a victim of a future faker that wasted 5 years of her life. Ever since she's been advising me against moving in.

I'm analyzing this and I don't feel comfortable nor secure cohabitating with him. I have my doubts. Is it ok to be very hesitant?

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Plus I would like to add he tried to deviate from my questions by reminding me about our love towards each other. Ok but what does our love towards each other has to do with my direct questions? What does our love has to do with my question about a timeframe for moving in?
Is it ok to be unsure about moving in with my boyfriend if he isn't giving me any valid reason nor timeframe?
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