falling out of love

I feel like I’m falling out of love with my boyfriend. i just don’t feel the same, it’s like we’ve gotten too comfortable in the relationship and i’ve spoken to him about it, it changes for a week and then it’s just back to old habits. All of the “cute” quirks he used to have just annoy me now. I genuinely love him and I don’t know what to do and at the same time I feel like this is just a phase. I don’t really know what I’m looking for.. probably just to vent and any words of advice