There could be several reasons why a guy might say he wants his ex-girlfriend back but makes no effort to actually pursue a reconciliation or contact her for months:
Uncertainty and mixed feelings: The guy might be genuinely conflicted about his feelings. He might still have lingering emotions for his ex but is unsure about whether getting back together is the right decision.
Fear of rejection or failure: He might be afraid of reaching out to his ex and being rejected. The fear of facing the same issues that led to the breakup or the fear of not being able to win her back can hold him back.
Pride and ego: Sometimes, people's pride can prevent them from making the first move. They might want the other person to initiate contact, as making the first move might be seen as a sign of weakness.
Desire for control: By expressing a desire to get back together without taking any action, he might be trying to maintain control or keep his ex-girlfriend emotionally invested in him.
Moving on: It's possible that after some time apart, he has started to move on and is no longer as interested in getting back together.
External circumstances: Life events, personal challenges, or other priorities might be taking up his time and energy, making it difficult for him to focus on a romantic relationship.
Regret and nostalgia: He might feel nostalgic about the relationship and have regrets about the breakup without necessarily wanting to rekindle the romance.
Incompatibility: Even though he might have feelings for his ex, he could recognize that they are not compatible in the long run, which could be a reason for not making any effort to get back together.
It's important to remember that everyone's situation is unique, and without knowing the specific individual and context, it's challenging to pinpoint the exact reason. If you find yourself in this situation, it's essential to prioritize your well-being and not wait indefinitely for someone who is not actively pursuing a reconciliation. It may be helpful to focus on your own growth, healing, and exploring new possibilities for your life.