I need advice. On Monday my girlfriend accepted a walk home from work from a guy. She told me about it yesterday, the day after. She said she wanted to tell me in person. I've never met the guy. She said she accepted the walk because she was horny and that he has a girlfriend that also works there who was also horny. She says on the walk they joked about meeting their partners on Tinder (we met on FB dating app lol).... We discussed being more protective of the relationship and being careful and then the next day she walks home with a player type guy like this and jokes around with him and sucks him off for 15 minutes in the alley. I ended our date last night after she told me because I've been having a weird feeling about this guy. Anyway you all think it's ok she got this ride home and could easily happen again or should I be letting this go? Please let me know your thoughts I'm struggling with this..

Pic of the deuche