What's interesting about having a girlfriend?

I consider myself being single my whole life.. the couple relationships i had were never long enough nor interesting! I spent practically all my time working on my engineering degree... Now that i got it, all my energy is focused on my professional life (work) ... My closest friends are all getting married while i have no one.. and being single this long, i don't even think it's worth the trouble... So, i need your honest opinions about this and if possible someone with a similar experience maybe tell me how did you get through it?
What's interesting about having a girlfriend?
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