1. Does he resist your physical contact?
The first method is to pretend to accidentally bump into him and observe his reaction. For example, when you're sitting side by side, casually touch him with your knee or arm. If he adjusts himself, he's likely not interested in you. Conversely, if he doesn't instinctively resist and even moves closer to you, that's a good sign. Everyone has a personal space where they feel comfortable, and they won't mind being "intruded" upon by someone they like.
2. Try different topics for conversation.
Everyone responds to different opinions in different ways. If your topic has a slightly erotic undertone and he avoids it, it means he doesn't want to take things to the next level. If you text him saying you miss him and he ignores it, he's probably not interested in you. Men can be shy too, but if no matter how you subtly hint at it, he can't flirt with you, then it's time to wait for a new relationship.
3. Observe their eyes
When you make eye contact, see if he stares at you intently for a long time, and if there's any spark between you. You can tell just by looking into his eyes!
4. Have your friends "test" him.
You could let him meet your friends and see how he reacts. If he shows interest in not everyone, he might have feelings for you. Of course, there's also the possibility that he's fallen for one of the girls. If that's the case, don't show your displeasure—after all, it's better to know sooner rather than later that he doesn't reciprocate your feelings.
5. Offer dating suggestions
You can suggest going to a movie or having dinner together. If he starts making plans, it means he's looking forward to the next date. But if he completely forgets about it, it means he doesn't want to go out with you.
6. Test his reaction with your past relationships.
If you talk to him about your past relationships and he defends you in every way, then he's very interested in you. Of course, if he shows any signs of jealousy, that would be even better.
7. Be brave and ask questions!
If you don't want to beat around the bush or misunderstand your relationship with him, then be brave and ask him directly if he has feelings for you. Since you can face him honestly, you should also be able to accept his possible response.