The most frustrating thing to experience when you're single is to receive mixed signals from somebody you're interested in. What's more frustrating is realizing that this entire time, you're missing the bigger picture, and there really is no such thing as a mixed signal.
If this person was really into you, you would know. The feelings wouldn't seem so foggy.
For instance, if they say things that lead you to believe that they're interested in you but their actions don't seem to quite match up, they aren't into you. I'm sure you've all heard the coined phrase "actions speak louder than words" and I'm letting you know that this is 100% applicable to these types of situations.
Another situation is that this person can seem interested in you, but only when it's convenient for them. One day you guys could be hanging out, flirting, and things could seem to be going in the right direction. The next day this person ignores your texts, doesn't make any effort to hang out and seems to be avoiding you. This is a classic case of "I-don't-want-all-my-eggs-in-one-basket" syndrome and this person is a player for sure. This person isn't sending mixed signals whatsoever, the message is clear. This person is into you, but not just you. If you have any sense of self-worth you should know better than to continue on with this individual if you've been struck with the feels.
If this person is all about you, but only in private, then there is no mixed signal there. Sure when it's just the two of you things seem to go well but that doesn't equate to a healthy type of relationship beginning to form. You may think that this person just struggles with commitment, or doesn't seem to know what they want right now, or whatever. You're constantly making excuses as to why you two can't have a "normal" type of relationship. The signals here are perfectly clear but they're only clear if you open your eyes. If someone can't show you any feelings in public that is a giant red flag. This person isn't interested in you.
I'll be the first to admit that some people may struggle expressing how they feel but I promise you if someone wanted to be with you, they'd be with you.
No matter the situation, I'd like for you to know that you deserve someone who is into you all of the time. Sure, mixed signals are frustrating, but it's more frustrating to be someone as amazing as you wasting your time on somebody. Stop spending your time, effort, and energy trying to decipher whatever types of signals this person is sending you. The longer you stay in denial, the longer you'll be disappointed.
You deserve better than that.