What to do wisely?

I kinda find out that my stepfather ~loves~ me. I’m 22. I know him for like a year. I dont think i could avoid him because if i do it then i have to also avoid my mom, which i can’t do.
But he is showing me a little more ~affection~ and buying me things i like. I’m sensing that he’s giving signs that if we could do something about it in secret. I don't know i don’t want to do anything at all with him, i just see him as a great man for mom.
I dont wanna ruin their relationship, he loves my mom but i kinda think he loves both of us. Should i be bitchy to him so he avoids me, or what should i do so he would stop this game? I dont really wanna talk a lot with him because i dont want him to think that i’m probably interested
What to do wisely?
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