<human>: Can you provide a brief rundown of the text in within 3 sentences?

Ok, so first things first I'm bisexual. My SO had some questions about my sexuality at first, but has been very accepting otherwise. I think my being bisexual is part of his concerns.

 I have a close relationship with my best friend (we'll call her Emma), but we've never done anything remotely sexual together. We've been best friends since we were both five years old and we have a very close connection, but I would never even consider being with her romantically or sexually.

Last summer my Dad was having some serious mental health problems and he kicked me out of the house. I went to stay with Emma and her family, and I had been dating my current boyfriend (Parker) for about 8 months at that point. 

When Parker was a bit drunk a week or so ago he said he thought I'd been sleeping with Emma and had spent the summer I had to live with her cheating on him. At the time he never said he had a problem with me living with her, never said he thought I was cheating and I was totally blindsided by him saying "I just assumed it was true." after I insisted that I hadn't.

I was really upset about this, more about the idea that he's assumed I'd cheated on him and had thought that for a year without saying anything, but also because of his reaction to me being upset about it. When I got upset about it he said "You're being awfully defensive for someone who hasn't done anything, aren't you." He doesn't understand why this would upset me when I haven't cheated on him.

He had some hangups and jealousy issues very early on, as his last girlfriend cheated on him for months. I'm trying to be understanding but it's been really hard finding out that my SO thought I'd cheated on him and didn't believe me when I said I hadn't. I don't really know how to approach this with him - he thinks it was a reasonable assumption to make. I don't know if this is because of my sexuality or something else.
<bot>: My boyfriend is convinced I had an affair with my best friend last year. He told me this about a week ago. He doesn't understand why I'm upset and I'm worried it might be because I'm bisexual.