Missing the idea of him..

So I'm in a committed relationship with my current boyfriend, we've known each other and talked on and off for 2 years until we made it official 5 months ago. He's like perfect, everything I want. BUT my ex( who I lost my virginity too) has been trying soooooooo hard to get back with me.. And I am not leaving my current boyfriend to go back to him, hell no, but i think I just miss the idea of being with my ex.. Like I catch myself thinking about what it would be like if we were still together.. And I think about how it was when he took my virginity.. I love my boyfriend im with and im staying with him.. But my ex just really throws me off.. Can anyone relate?