Help please!

Hello, So i've been in a 5 year relationship, i've only been with him sexually and he's only been with me. We love each other very much. I guess you're probably wondering whats the problem then? Well i'm not sure there is one except I met my current boyfriend when I was 18. I haven't been with anyone else sexually and I feel like i'm missing something. About a year ago I really wanted to get married and I was really excited about it. He's not so excited about this idea of marriage. So for me I accepted it and moved on, I'm graduating college soon and starting a new career and hes still un motivated to do anything financially productive with his life. I'm excited for the future all i want to do is move and start a new. He would rather play video games and watch porn which i'm fine with mostly. Ok so you may be wondering what has changed. Well recently I took a trip to Las vegas, it was fun and exciting. I went to a night club with some girlfriends who are all single by the way. There i was dancing around them but by myself because I have this rule that dancing or grinding with another man when your with someone is uncalled for. Ok so here I am having fun with my friends when this guy approches me and we got to talking. He told me how beautiful I was and how he would love to be with me. I was flattered but still thought of my man. Nothing happened, but part of me wishes it did. Now i'm at home in are apartment we share together and I feel alone. I feel like my life is boring, uneventful. I don't know what to do I just know i'm not happy. How could this one moment change everything? Please help, I don't know what to do.

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