How to ask him for consistency and reliability going forward

You're not asking him to change his personality. You're testing whether he can meet a basic standard of behavior that a relationship requires. Unreliability usually isn't random. It's either a pattern he's comfortable with, a sign he doesn't prioritize you, or both. Before you talk to him, make sure you've seen the pattern more than once. One canceled plan or a few quiet days doesn't mean you need this conversation. But if you're noticing a recurring cycle of him pulling away and reconnecting, or if you can't count on him to follow through on what he says, that's different. You're at the stage where staying silent means accepting the situation as is. He won't know it bothers you unless you tell him. And he won't know what you need unless you say it plainly.

Your goal is not to persuade him or help him understand why he should care. It's to state what you've noticed, explain what you need, and give him the chance to step up or step out. First, describe the specific behavior without judgment. Don't say 'you're emotionally unavailable.' Say 'I've noticed you go silent for stretches of time' or 'you've canceled on me several times.' He needs to know exactly what you're talking about. Second, connect it to why it matters to you personally. This is not about rules or what a 'good boyfriend' should do. It's about your needs. Say something like 'I need to know I can count on you' or 'I lose trust when there's no communication.' Third, state what consistent behavior looks like going forward. Be specific. Does he text you back within a day? Do you have a standing check-in? Are canceled plans rescheduled immediately? He should leave the conversation knowing what you're asking for, not guessing.

Don't bring this up when you're angry or mid-conflict. Choose a calm moment when you can talk without an audience or major time pressure. Text can work if that's how you normally communicate, but a phone call or in-person conversation gives him less room to misinterpret tone. Send it when you've had time to think clearly, not in the heat of frustration. Then wait for a real response. A few hours is fine. A day or two is reasonable. But if a week goes by with no answer, or if he responds with defensiveness instead of engagement, you have your answer. He's not willing to have the conversation, which tells you he's not willing to work on it. Don't keep pushing after that. Don't send a follow-up text restating the same thing. If he goes silent after this conversation or dismisses what you said, that's when you decide whether to stay or leave. This conversation isn't the start of negotiation. It's a clear boundary.