Why did he say he need time to think in our situation?

We met online dating app & live in diff states. We click. He was consistent and went hard on attention the 1st week. We talked everyday. We told each other we love each other. he told me on his own he stopped taking to other girls after he started liking me. Talked about me being wife material & mentioned multiple times in a teasing/serious way he wants me as his wife someday. Everything felt right, but then he got super busy with family/work/life. We still text everyday but he always seems exhausted & spreading himself thin with busyness. We rarely had proper calls anymore except late at night where he falls asleep.. I tell him almost everyday my anxiety/concerns with feeling sad we don’t get our calls much anymore, but I also have been patient&supportive with his busy life. He’s usually very gentle, loving, & reassuring.

This past week he said he would give me proper calls, but did not follow through with our miscommunication on when he will call me & me feeling upset he knew I wanted earlier calls for quality time. I told him how it makes me feel like I don't know if he really love me when he say he does when he’s not following through. he said he does and made it sound like he would really make time last night and this weekend for us… but he didn’t last night. I cried telling him how sad it made me because I ended up waiting since his msgs appeared like he would call me soon but didn’t as it gets really late. he asked me if I think we moved too fast and wanna go back being friends where we do everything the same except I won’t wait and cry anymore while he can call me whenever and I can do the same. I told him I don’t see the difference and how I don't know if he wants the samething as me with quality time. he was quite and said he need some time to think & will talk to me today. I noticed he was not on social media for most of the day (not usual), didn’t check my stories, and he also never contacted me… I’m scare this is his easy way to walk away
Why did he say he need time to think in our situation?
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