It's really a 50-50 chance. I did gather some indicators from a website and will list them below:
1. They keep looking at you
2. They get anxious around you
3. They initiate eye contact
4. They make casual physical contact
5. They change their body language around you
6. They try to sit near or next to you
7. They listen to you
8. They want to get to know you better
9. They try to get an idea of your plans and aspirations
10. They may inquire about your relationships
11. They call or text you a lot
12. They respond immediately
13. They get jealous when someone else flirts with you
14. They ask your friends about you
15. They find excuses to spend time with you alone
16. They talk about you often
17. They share secrets with you
18. Your mutual friends act differently when your crush is around
19. They’re aware of your needs and want to help
20. They look for you at social gatherings
21. They’re always at their best around you
22. You remind them of positive things in their life
23. They trust you
24. They flirt with you
25. They try to keep you happy
