Money is hurting my relationship [I Need Advice On Relationships]

3 months ago my bf and I had to leave our old place due to a fight with our roommates. We're living in an RV at my parents and now trying to move out again. My boyfriend and I get along wonderful except when it comes to finances and this situation has us having to focus on our money. We just don't see things eye to eye. I'm starting to resent him because I believe he's unambitious and unwilling to improve himself. He's starting to become irritated with me because I bug him about saving money and spending excessively. I'm just tired of this.