i understand how unhealthy this sounds.

I feel like im going crazy because I cannot accept at all that my boyfriend has been with anyone before me. It has gotten to the point that knowing he has an ex makes me want to throw up. 

it just drives me crazy and i cant really understand why. my closest guess right now is because i dont want to imagine being with anyone but me. 

we have been in arguments because of me getting mad about it, and hes trying his best to understand. 
Im trying to control myself, im just running out of ways to not think about it all so much