Breakup Advice needed

I’m bi and I don’t date or click with a lot of guys, so when my ex (a guy) told me all this stuff about caring about me and wanting to be in this exclusive relationship I told him I hadn’t been one for like four years. I broke up with him yesterday for continuously canceling and never being there when he said he was.

My question is how am I supposed to trust people will be there again when they say they will? I feel like I was lured into a relationship I wasn’t ready for but he kept telling me it was going to be good for us or me or whatever but now he is just this passive person not caring enough to put in a little effort. How do you even tell when people like him are lying?