It sounds like your ex-boyfriend is expressing that he's not currently interested in putting the effort into rekindling the relationship. When someone says something feels like "a lot of work," it typically indicates that they may not be ready or willing to invest the time and energy needed to make it successful.

This doesn't necessarily mean anything negative about you or the past relationship – sometimes, people just have different readiness levels or priorities. Here’s what you might consider doing:

1. **Reflect on Your Needs:** Think about what you genuinely want from this relationship and whether he's able to meet you halfway. It's important to be with someone who is as committed and enthusiastic as you are.

2. **Communicate Openly:** If you need more clarity from him, you could have an open and honest conversation. Ask him directly about what he means and why he feels the way he does. It might help to understand his perspective better.

3. **Focus on Yourself:** Regardless of his response, take this time to focus on yourself—your happiness, growth, and well-being are essential. This might involve spending time with friends, pursuing hobbies, or setting personal goals.

4. **Be Open to Moving On:** If he remains firm in his stance, it might be best to consider moving on. Holding on to hopes of rekindling something that isn't mutual can prevent you from finding someone who fully appreciates and reciprocates your feelings.

Remember, relationships should add value to your life, not drain you. Trust your instincts, and make the choice that feels right for you.