Two men, one girl
As a rule, the heterosexual friendship usually appears as a result of man's affection with woman. Though, he realizes that he there is no chance for him to become her boyfriend and so he agrees with the role of a friend. And woman is to naïve to realize what is going on and here you are – another couple of heterosexual friends.
Problems start when a girl finds the one she fall in love with. There are a few men able to realize such kind of friendship and so they are usually jealous and sometimes even mad about male friends of their girlfriends. A good number of troubles and quarrels appear as a result of such misunderstanding.
So, in case you have male friend and he is a friend of you for a long time and during this time he never had a girlfriend think about, may be it is nit just friendship he feels about you. In this case it is better to make things clear and to talk to him as otherwise you will get unto trouble because of such fake friendship. You can lose both: a friend and a boyfriend.
Realize that a man you are in love with loves you and it is okay that he is jealous about a guy who always next to you and who spend a great amount of his time with you. Think over it especially in case it is a true love. There is no ay for you to lose your love for the sake of a guy who is so chick that he can't even tell you about his feelings.