Men are like zits
Men are like zits, the big juicy ones. One will show up uninvited and you're like, "really? REALLY?" but actually you can't wait to squeeze it. So you squeeze it as much as you can, you invest so much into your relationship with him because you're head over heels but all that ends up coming out of him is pus, pus and more pus. Zits come and go though, that's life. And some of them end up leaving a little scar which never seems to fade.