Love is such a hard thing to define. To some people it's a feeling; to others, it's an action. And although it can be challenging to pin down exactly what love is, its manifestations are pretty easy to identify.

Here is a list of signs he isn't in love:

1. He doesn't remember things you tell him

2. He compares you to other women

3. He avoids physical contact

4. He doesn't have respect for things that are important to you

5. He's uninterested in solving problems

6. And when you try to solve problems it turns into a big fight

7. He doesn't make time with you a priority

8. He tries to change you

9. He doesn't offer to help you

10. He's constantly on his phone when you're together

11. His goals don't align with yours

12. He doesn't trust you

13. You are losing trust in him

14. It's hard to talk about things that are important to you

15. He puts you down, even if it's "joking"

16. His friends and family don't know much about you

17. And he doesn't respect your friends and family

18. Being around him doesn't make you feel good about yourself

19. He doesn't share personal details about his life with you

20. He never says "I'm sorry"

21. He tells you he needs space

22. It's hard to have a good conversation

23. He's easily annoyed by you

24. You're not his No. 1 priority

25. He's consistently negative

26. He keeps secrets

27. He doesn't talk about the future

28. He's not curious about your life

29. He doesn't treat you differently than other people

30. He spends a lot of time talking to other girls

31. It's not obvious that he loves you

At the end of the day, you can feel it in your gut. If he loves you, he will make sure you know it.