Ive been dealing with this male friend for 3 years now and he want to stop talking to me and deal with other people but its breaking my heart because I just found out that he had been talking to other girls (sexually) in his cell phone I don't know what to do because its like the man I love the most is walking out of my life and he don't care about my feelings. I have invested so much into this and that's what I don't understand so many thoughts, emotions running through my mind right now all I do is think about it when I'm alone. All we is do fuss but the truth is I'm just frustrated and he understand how I'm feeling in the inside :-(

You wrote friend, not husband,not fiancée,not even boyfriend. You cannot control whom a friend speaks with on his cell phone, nor what he speaks to them about.

If you are wanting more from him then friendship, then you need speak to him about this and see how he feels. If he doesn't want anymore of a relationship then JUST friends you will just have to accept that.

Then maybe sometime apart is what he needs. You say he understands your feelings. Your feelings just didn't happen over night so give him time to understand his.
You're going to think about it a lot especially when you're alone. That is life and it doesn't come easy. Just keep yourself busy and understand that he wants to try some new things.