How do me feel deeply when they see their love (now ex partner) moved on with another man?

I genuinely would want to know for men how it feels when you guys see that the one girl you love is now moving on in her life ? Like she is marrying, or is in a relationship, having kids etc.

Like when you get to know confirmed that it is happening, how does it feel I would like to know in detail because I do know about how it feels from a women's perspective but I am curious about the male psyche as well.

What do you feel after that ? What thoughts come to your mind ? Does the hurt ever end?

Especially like when you know that she deeply loves another man now and is completely moved on in her life.

What happens in cases like this. give me everyday mini detail that men feel because ik obv they have emotions too, and I have heard somewhere too that men are much more complex in feelings when it comes to the feelings of losing their love to another man and jealousy. Do you feel as if the other man won in life who gets to be with her, marry her, touch her for life, have kids with her, take her out, make love to her etc etc.

Does your imagination work like that ? Because for women it does, we do think about them in every aspect with their partner which Obv hurts , we think of both emotional and physical intimacy . I would just like to know how it goes for men.

Btw if you are dealing with this, sending hugs to you🤍