I like my churchmate who has a gf 🥴

So I met a guy, he's 5 years older than me.. a man of god, tall, family oriented. He teaches word of god and I gotten close to him. He invites me to church, until I became a regular (like went to their church often) we went to church on my birthday, and among other things.. I started to feel something, I didn't know he had a gf since it was probably lowkey.. I noticed small things about him, how he talks, his perfume, the way he laughs, what he likes and dislikes.. we went out every sunday after going to church, the way he opens his arms so I can hug him whenever I cried during our study, the way he's soft spoken with me. But he always brought this girl.. I thought it was his best friend, or family.. until I caught him calling her "love".. I was shocked, tried to ignore it... but I kept seeing the signs, they we're so close, so clingy.. and tried to hide it, like "lowkey", until I found out it was true when I saw it on his phone, her name was pinned on top of his messages and had the nickname "my love". (I don't want to explain it further, but they were lowkey because of private reasons, but they were legal on each others family.) And the thing is, I can't move on.. I need advice, as much as I already know the answer, I need to see it from you guys, because.. I can't help myself when I see him every twice a week, we remember small details about each other, actions that felt intimate but.. probably isn't.