Some guys will lie about their feelings if they know that it would give them an advantage.
If he knows that by telling you that he cares about you, he will get what he wants from you, he just may tell you that.
If he knows that by telling you that he agrees with something that you said, he would get you to stop asking him about that particular topic, he just may do that so that he can get you to stop asking him.
It really depends on the kind of guy you are dealing with and the kind of relationship you have had with him up until this point.
The best way to figure out if he is telling the truth or lying about his feelings is to observe his body language behavior when you talk about his feelings, the content of what he says and also what he does afterward.
If he speaks to you with direct eye contact and doesn’t avert it much by looking away, it can be a sign that he is being sincere and not lying about his feelings.
If you notice that he doesn’t have too many breaks in-between what he is saying, this can also be a sign that he is not lying to you about his feelings.
If there were too many breaks, he may be taking the time to think up a lie or an elaborate story of some kind that isn’t true.
That’s how his mind may be working.
When he speaks naturally like he would in conversation, there is an ease and flow of his words that would typically indicate that he is speaking from the heart and being truthful about his feelings.
If you notice that his body faces you and he is close to you, he is showing that he is not trying to deflect the topic.
In other words, he is facing the topic head on and is in your space.
He will also be more descriptive when he talks about his feelings.
When he is truthful about his feelings, he will be more specific as to what he is feeling and may even give you dates and times that he had these feelings.
He will be detailed in what he tells you.
He will use descriptive words.
When he is lying about his feelings, he will be relatively vague in what he tells you.
He won’t give you too much explanation and may even sound rushed as though he wants to really end the topic as quickly as possible.
Also, observe what he does after this conversation.
If he is showing you true signs of affection or whatever feelings he mentioned in your conversation with him, he may be truthful.
His actions over a relatively long and consistent period of time from here on out is normally a strong indicator of how he truly feels.
Allow him to back up what he has said through how he behaves.
For this to work, you would have to avoid bringing up the topic for a while.
If he keeps acting right, without you having to constantly remind him about his feelings, he was being truthful.