<human>: Condense the text into a few key points

Ok, so I'm 24 she's 23. My gf has been spending time with a friend whom she's known for a long time. Last night she spent the night at his place because he was the only person who could help her design a website. Understandable, I guess, given that she has a deadline to meet and is just about panicking. 

Due to her overwhelmed feeling from this work, whilst getting help from this old friend, she also happened to receive much needed comfort from him because I wasn't there (y I no know this website design stuff?...)

Long ago, I told her I didn't feel comfortable with her spending time with him since they had gone out on dates in the past. Well, this morning she tells me that he still has strong feelings for her, and continues by saying he has stronger feeling for her than I do (ugh, the nerve).. This is a bit frustrating given our 2+ year relationship. 

I don't know reddit. Is it reasonable to feel jealous/worried/concerned that she is spending time getting school related assistance from this friend? I would hate to be one of those overbearing partners. I also did tell her that I was unable to help her much given my own large burden from school work. 

She seems very moody (before I risk getting verbally slapped) since she began taking "the pill." Darn those mood swings.     

What to do? . ..what to do . ?
<bot>: Gf spending time with old friend (who has feelings for her) getting e-assistance. Is it reasonable to feel jealous/worried/concerned?