Best way to convince my man that I am not dating my boss?

Gloree
My boss got me a pair of pants trousers for my birthday. I showed it to my boyfriend with excitement but noticed he wasn't happy with me. He was questioning how the man knew my size and if he was making advances at me. My boyfriend works in thesame office as me though different buildings so we see often.
I explained it wasn't my size as I had to give it to a tailor to reduce the hips and waist before it fit. He managed to understand.
Later, my boss's wife got me an anklet after I admired the one on her leg. My boyfriend didn't like it as he perceives the woman might be gay. And I should stay away from her. We managed to get over this.
Now my boss got me a scarf. I had to hide this one because I didn't want any issues. Then my boss got me a dress and I would have hidden it but my boyfriend walked in as I was leaving my boss's office with the gift. He got mad again with suspicion but I explained my boss is just fond of me and we managed to settle.
Then last week, my boss got me coffee he got from overseas. I was about to put it in my bag when my boyfriend entered and saw it cause he came to get me for lunch. This caused another session of questioning. How did he know I love coffee. So we chat and talk on phone? Etc etc. I tried to explain but he is very furious, asking what do I want? Isn't he doing enough? Etc etc. I have never seen him so furious. I know my boss is harmless but he feels the man is looking for something. Is he not being unfair? I mean, my boss is about 62. Why is he threatened? And how do I convince him that I'm not messing around? After all, he already knows I'm still a virgin so he should not have any issues with my boss. I need advice cause this thing is causing a strain in my relationship. It's not like I can tell my boss to stop giving me gifts, come on. Please, I need some advice.
Best way to convince my man that I am not dating my boss?
6 Opinion