my old professor want me to be his gf

My first semester of college I had the best professor ever. I was pregnant & he was such a big help. He left in the middle of the semester & said it was because the school claimed he talked to female students inappropriately. I didn't believe it. He's only 26, we just talked to him because he was so understanding & the only adult that could relate to us. Then I met a guy that went to my school & we went on a date once. When I told him he was my favorite professor his immediate response was "he was fucking girls up there" I didn't believe it! The professor gave me his number after he left but always kept the conversations professional. Recently this professor told he that this whole time he wanted me. He said he loved our chemistry. I'm in shock! My roommate kept saying she thought he liked me but I kept telling her she was tripping. He keeps telling me he want me to be his gf but idk. Idk how to take this. Idk what to do. I'm 18. I do find him attractive & we always had great conversations but idk. I just needed to tell someone