There could be various reasons why your ex is liking your posts on social media even though he has a girlfriend. Here are some possible explanations:
Remaining Friends: It's possible that your ex still wants to maintain a friendly connection with you even after the breakup. Liking your posts might be his way of showing support or staying in touch in a casual manner.
Nostalgia and Fondness: Liking your posts could be driven by nostalgia and fond memories of your past relationship. It doesn't necessarily mean he wants to get back together, but he might still have positive feelings towards you.
Attention and Validation: Liking your posts might be a way for him to seek attention or validation, especially if he's going through a rough patch in his current relationship.
Keeping Tabs: Some people like to keep tabs on their ex-partners to see how they are doing post-breakup. Liking your posts might be a way for him to keep updated on your life.
Innocent Gesture: Sometimes, people may like posts without overthinking their actions. It could simply be an innocent gesture without any deeper meaning.
Trying to Spark Jealousy: Unfortunately, in some cases, an ex might like your posts to provoke a reaction from you or make their current partner jealous.
Regardless of the reason, it's essential not to jump to conclusions or read too much into social media interactions. Liking posts on social media is often a superficial and ambiguous form of communication, and it may not reflect the true feelings or intentions of your ex.
If you find that his interactions are bothering you or affecting your emotional well-being, it might be best to consider limiting your social media interactions with him or even unfollowing or blocking him, at least until you feel more emotionally detached from the situation. Focus on your own healing and personal growth instead of trying to interpret his actions.