past relationships

Ariel
So my boyfriend and I have been together for almost three years now but I just recently found out that a girl he said was a friend of his was actually his ex.
Not only that, but in the beginning of our relationship I would let him go over and sleep at her place unaware that they were once together.
On top of that his sibling mentioned the very first day he brought me home to meet his family, he had another girl over the night before. 
I know it should be the past but we have had a rough couple of years. 
We haven't had sex because of his medication and I just can't help feeling like he just settled for me. 
An I crazy to feel like this or would it also annoy the crap out of you!?
Any advice. 

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