Did he change his mind?

Hi guys! So there is a guy that I really like. He asked me to go out with him and I agreed. But he's a little older and we decided to wait until the end of the semester to go on a date since we were both busy. He's always been open about telling me he likes me and compliments and things like that. I've been complimenting him too but I haven't told him I liked him yet and I don't compliment him as much because we haven't even gone on a date yet but I really want to tell him how I feel. It's something I've struggled with and we agreed to go out about a month ago. I just felt like it was a lot of time for him to change his mind. We text pretty much everyday and I always try to show that I care in little things, I've always been like that. Lately he's been taking a lot longer to respond (he's a professor at a college, not the one I go to, and he has finals for his students to prepare and he's taking an online program so he has a final in that too and he's working on renovations.) I understand he's busy and he also has his own life. But today, he messaged me, like a normal conversation. And he has been online a few times since then (this I found he has done a few times in the past but we seemed okay.) I just have this feeling that something is different. I thought something was different before with him (I did go to the college he teaches at but he was never my professor and I just got my associates and am now going for my bachelor's. We couldn't date as long as I was at the same college he taught at so we have been waiting a while) before and I was wrong. Do you guys think he is ignoring me? I also feel as though I messed up a little and that he doesn't fully trust me. I've been wanting to call him and talk to him about how I feel and that I would never do anything to hurt him but never know when a good time to call him is. He still hasn't texted me back and it's been all afternoon. But he has been online a few times since I responded. What should I do?

Edit: The reason I feel as though I messed up a bit is because I have a friend he doesn't approve of (like most of my friends and family) and told me not to go to his house anymore. I did because I felt guilty because my friend is dealing with a lot right now and Im really the only person he has (my friends think my friend is taking advantage of me). And I did go once and he saw it as I tricked him. But I thought we were okay because we made a deal to tell each other things. I also recently saw a movie by myself and I felt as though he didn't believe me, he asked me if I was sure.