Need advice really badly, will give more details about me, the

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Need advice really badly, will give more details about me, the trans girl or the other girls and my situation if it helps

so, i've loved a girl for a long time, i've asked her out, she rejected me, but i still love her, anyways recently i met a m2f trans, now i was a straight guy, and never been with a guy or a trans before, so this was all new to me, and i asked repeatedly that we take it slow, we've had a couple of dates, slept with eachother ect she's really sweet, but is also clingy and wants a real long term thing, i've been honest and told her i'm not sure, but i cannot get this other girl out of my head, the trans girl is now saying she loves me and stuff, i can't say it back, because, even though it's not mutual, i love someone else, it will probably never happen, hence i started dating other people to get away from my feelings, but i don't want to string this trans girl along, she's sweet and kind and deserves better than that, but me being honest will crush her, and end a pretty good thing, but in my mind is the right thing to do, as it's the only way i can have respect for her and my own feelings, i can't make her second fiddle and i can't just stop loving this other girl, how do i break it too her? what should i say? should i even not tell her and just carry on like nothings wrong? i don't know, i'm in serious trouble here, i will emphasize that it's important to me that i'm honest and treat this girl with respect, i'm fairly ignorant to a lot of things but i do know trans people have a hard time from people, and get sexualized or hated on ect, to me she's a person and a decent one at that, so i have to treat her in that way

TL;DR not sure how or if i should break up with the trans girl i'm dating because my heart isn't in it