My gf (20f) gets upset when I (27m) use MY dildo… why can’t pleasure myself?

Yes you read that title right.

For context I’ve always liked back door stuff, whether it be giving or receiving it’s my biggest kink and pleasure.

My girlfriend and I have been dating and doing this for 2 years, she pegs me with a strap on and it’s great, she doesn’t like anal as much so I’m usually receiving altho I rather give more often. Anyways one day she caught me masturbating with my dildo and By “caught” it’s not that she actually walked in on me but i mean I left the lube out and the dildo wasn’t where we normally put it. she asked me if I was using it without her and I said uh yes, she got extremely upset. It varied from I “can’t control myself” to “are you gay?” To “I thought this was special with us” And I tried to explain that it’s just part of my masturbation, sometimes I just masturbate sometimes I play back there too. It’s MY private time to myself that I do when she’s not around. I’ve already given up porn for her, and myself, because she made my realize it was a bad habit and kinda gross, and I agree. But this is my private time no porn just me, why is it an issue?

She took no alternative, it’s either she leaves because she can’t be with someone that can’t control themselves, might be gay, and also doesnt want to share the experience with her. She’s also upset that I didn’t tell her I use it without her and counts that as lying, also I have another inflatable dildo she just found out about so she’s mad I lied to her about that one. She claims she can’t trust me.

I’m upset, we’ve been together for 2 years and this is the first time she’s “caught” me masturbating with my dildo.

Why can’t a man just fudge his froot loops no questions asked?

No im not gay, ive experimented with guys and found im mostly attracted to females with the exception of some very feminine males, im bi leaning heavy towards females and she knows this.

TL;DR gf thinks im gay, sex addicted, and a liar because i masturbate with my dildo. Why is she upset at me for this?