am I crazy?

I'm in the most amazing relationship. Best friends, lovers, have so many giggles and fun, BUT when it comes to him going on 'with the lads' as he puts it, my mind literally goes mental, I mean, uncontrollable thoughts wiz through my head. I panic, I worry what he is doing or with, will he come home, will he be ok. I can't sleep until he steps through our front door. It's ruining me. I'm sure it comes from a rubbish past where I was cheated on several times and I know space and time with friends is really healthy, so I know all of that - but how do I control myself? 🙁