My frined needs better advice from me.

Tell her to tell the guy that she likes how she feels. If she doesn't just so she doesn't hurt the other guy, she will make herself very unhappy. Or, to make things less stressful, she could just take a break from guys for the moment to get her priorities straight. It usually helps me to think if I take a break and do something that I enjoy. Then, the problem doesn't seem so BIG and URGENT. It creates a feeling of peace so one can make better decisions.

Threats aren't going to get you help, remember that.

There seems to be a lot of details that make it difficult to judge on the situation. Such as why is he now her ex (did she dump him, did he dump her, did someone do something wrong, etc). She's liked by one person and just wants her ex back, that's the truth, not loved by everyone.

If her ex still likes her, she should just get back with him, the other guy will get over it. If she's so concerned about hurting this other guy then maybe she has feelings for him and needs to figure it out. It all just really depends on what's happening with the ex (if he's moved on she needs to move on).