Is it normal that i like and fall in love with a tomboy if im straight?

In the first place we were just colleague and we start hang out together.During that time i do have special feelings on her,but i ignore the feeling because i dont want to ruin our friendship,i tried to ignore the feelings because i feel its not normal for a women to like other women.In the meantime, my other colleague told me she have a girlfriend.8 months after that, i was offerd to further study.When she heard about it,she suddenly text me she likes me.I was surprise because someone that i fall in love with do likes me.We texted each other for about 1 month,it was wonderful coz i feel somebody care for me.Eventually,after one month she started to slow down and she dont want to go deep into relationship because she said we are friends so it cannot be far than friends.She didnt even tell me why she start to slow down from texting me or call me.She posted her picture with other girl(her ex,friend and her love life)its really hurt me when i saw her post and the caption.From that moment i distanced myself and now i still cant move on,i try to act as professional as i could but she totally ignore me especially when we have reunion,she looked at me just like she look at the stranger.It has been 2 years 5 months im in a moving on process and still try to forget all things about her,and im very sick so sick.And now a friend of ours add me and my tomboy crush in a group.That make me even more sick.I dont have any reason to leave the group again,ive left once and the others ask me why i left the group,i dont have the answer.I also start to have feeling for the other girls now,but im still trying not to like girls because its not normal(in doubt)and im ashamed of my self.