Guys, Do guys get attached to their first?

okay so me and my ex from almost 5 years ago still stay in contact. He lost his virginity to me and we ended up breaking up a couple months later. And through this whole time we’ve been broken up he always comes back to me I don’t know why? He claims it’s nothing but am I crazy for Looking into it? I don't know. Like it’s been sooooo long since we actually dated but we occasionally do sleep together still. So I don't know if I’m just east access or what?

Guys, Do guys get attached to their first?
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