<human>: Can you succinctly summarize the text in 1-3 sentences?

I was kind of unsure of how to proceed with this problem.

So he (being a few years older) drove over to her house today to give her some help on her saxophone audition music since we have tryouts Tuesday. At the time her mother was at work and she was home alone. From what she said, the tutoring went like normal, but then when she went to go take a break on her couch, a fairly small couch i might add, while they just talked. 
However, from her accounts while they were talking, he became physically aroused and he began to tickle her every now and then on her side, close to her breast, and grab a little at her knees (Shes extremely ticklish) at one point even holding her down a little (he was not on top of her or anything). At this point she said she felt kinda scared that he might try to do more.  She stood up and told him to just stop, and that her mom said he could only come over for a little and that he should leave, and when she asked this by her account he seemed hesitant to do so, though he finally left after being asked a few times.

We discussed this and she feels uncomfortable about the whole matter, as do I. I am a pretty good friend with him as well, and this all seems out of character for him. I do not think ignoring it is the best course of action, and my girlfriend and I want to confront him about it, though we feel that he will just think we are crazy and take a lot of offense to it.
<bot>: Girlfriend's friend got a little too close, and made her feel uncomfortable while I would have been unable to assist. What do.