Just heartbroken

So today I can home to find my boyfriend of three years in our bed with a transgender girl that he has been seeing for a month. This just after a week ago of having a miscarriage. I just feel so low right now. I have never felt this alone or this much heart ache. I asked him why his only answer was she has parts you don’t have. So could just use so love for all the ladies on here. Thanks

Update

I have given him three days to find a place. The trans girl reached out and told me they have been talking for over a year now. And that she was so sorry. She also said that she ended thing. She asked me if we could grab coffee sometime. I want to be mad at this person so bad but deep inside she got screwed just like myself.