Help?

So I have a boyfriend. He’s really clingy and shorter than me (I’m 5’10”) but I’m not really into either of those. He said he was really depressed before I told him I liked him and it scares me that I’d have that much impact on his life. Last week I had a crush on my best friends bf and this week I have a crush on this other guy. I’m not sure I want to break up with my boyfriend but I don’t see this relationship going anywhere. Any advice?