i cought my girlfriend cheating with other men

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"I am a single boy of 24 years now and my girlfriend is 20 years old. Last week, I returned home early from work and I did not inform my girlfriend about it (I did not have any agenda here; I thought it would be nice to surprise my girlfriend and then bring her out for dinner). My girlfriend is still a student and I never suspected that she was unhappy with me or her life. I knocked on the door several times and there was no answer but I heard the TV set playing and that the door was locked in the inside. I had a key with me and I managed to get inside. I saw my girlfriend hiding in our bedroom shocked and shivering badly on seeing me. I asked her what was happening and she was breathless and could not utter a word at all. I noticed that the bed was a mess. I searched the house immediately and saw an unknown man to me sitting on the sofa in the family Room. I questioned his presence and there was no answer from him or my girlfriend. I was shocked, depressed and I left the house. Later my girlfriend told me that she knew that guy since 2 weeks through one of her cousins and she was starting making love with him when I rang the door. Then they panicked and stopped. I am still in a depressed situation and do not know what decision to take especially that i was planning to marry her in the future. Please help me."

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